{"title":"Bob’s Knobs","description":"\u003cp data-start=\"164\" data-end=\"428\"\u003e\u003cstrong data-start=\"164\" data-end=\"205\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eBob’s Knobs\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e specializes in high-quality, tool-free collimation knobs designed to make telescope alignment faster and easier. These precision accessories allow astronomers to adjust their optics safely and accurately, even in the dark.\u003c\/p\u003e\n\u003cp data-start=\"430\" data-end=\"583\"\u003eIdeal for both beginners and experienced users, Bob’s Knobs improve convenience, accuracy, and confidence when maintaining optimal telescope performance.\u003c\/p\u003e","products":[{"product_id":"bobs-knobs-for-skywatcher-celestron-newtonian-primary-swpri","title":"Bob's Knobs for SkyWatcher \u0026 Celestron Newtonian Primary (SWpri)","description":"\u003ch2\u003eBob's Knobs for SkyWatcher \u0026amp; Celestron Newtonian Primary\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: SkyWatcher Newtonian telescopes with factory collimation screws.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003ePrimary collimation\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003c\/li\u003e\n\u003cli\u003eThreads: Stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary Lock\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKnobs: Red plastic, 16 mm (5\/8”) diameter\u003c\/li\u003e\n\u003cli\u003eThreads: Stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr data-mce-fragment=\"1\"\u003eOur knobs will fit only a primary with factory collimation screws. If your telescope already has factory collimation knobs (see Item B below) our knobs will not fit.\u003cbr data-mce-fragment=\"1\"\u003eThe telescope optical tube assembly will clear the Dobsonian rocker box with primary knobs installed.\u003c\/p\u003e\n\u003cp\u003e\u003cbr data-mce-fragment=\"1\"\u003eKnobs with shorter screws and spacers replace the factory flathead Phillips collimation screws. Knobs with longer screws replace the factory set-style (grub) locking screws.\u003cbr data-mce-fragment=\"1\"\u003eSince the factory collimation and locking screws are close together, knobs must be staggered in height. The locking knobs protrude further than the collimation knobs, and they are red in color.\u003c\/p\u003e\n\u003cp\u003e\u003cbr data-mce-fragment=\"1\"\u003eProtect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSome SkyWatcher models are equipped with factory collimation and lock knobs. Our knobs will not fit these telescopes. Although the lock knob is small, its proximity to the collimation knob prevents replacing it with a larger knob. Furthermore, the primary adjustment knob is of a different design than our replacement knobs.\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"Default Title","offer_id":43125887074533,"sku":"BOB-SWpri","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-skywatcher-and-celestron-newtonian-primary-swpri-astronomy-plus.webp?v=1690487891"},{"product_id":"bobs-knobs-for-common-newtonian-secondary","title":"Bob's Knobs for Common Newtonian Secondary","description":"\u003ch2\u003eBob's Knobs for Common Newtonian Secondary\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron C8-N\/NGT, C10-N\/NGT, Celestron \u003cspan\u003eStarSense DX, Explorer Newtonian telescopes, \u003c\/span\u003eOrion Astrograph, Astroview, SkyQuest XX and XT, Skyview, SkyWatcher, StarBlast, GSO, and many others.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSecondary Characteristics\u003c\/strong\u003e: 4-vane spider, a deeply recessed center screw, and factory headless set (grub) collimation screws. The secondary plate holding the screws is about 20 mm (3\/4”) thick. This is a very common Newtonian secondary configuration.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003eWe offer knobs with screws having either 30 mm or 35 mm length. Order knobs with a screw length sufficient to allow the knobs to clear the secondary housing. Knobs with 30 mm screws are the most common in this configuration.\u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"30 mm","offer_id":43575452696805,"sku":"BOB-CNsec30","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"35 mm","offer_id":43575452729573,"sku":"BOB-CNsec35","price":32.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-common-newtonian-secondary-astronomy-plus_86957b57-8459-4761-aec9-3c5c82335db4.png?v=1690487891"},{"product_id":"bob-s-knobs-for-celestron-14-sct-c14metphi","title":"Bob’s Knobs for Celestron 14″ SCT (C14metphi)","description":"\u003ch2\u003eBob’s Knobs for Celestron 14″ SCT\u003c\/h2\u003e\n\u003cp\u003eFits:\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003e Celestron 14” (36 cm) f\/11 SCT versions with \u003c\/span\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal; color: #000000;\"\u003efactory headless set-style\u003c\/span\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003e (\u003c\/span\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003e\u003cu\u003e\u003ca title=\"C14SetAllen\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page27\/page104\/index.html\" style=\"color: #000000;\" target=\"self\"\u003eAllen\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003e or \u003c\/span\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003e\u003cu\u003e\u003ca title=\"C14SetSlotted\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page27\/page105\/index.html\" style=\"color: #000000;\" target=\"self\"\u003eslotted\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003e) \u003c\/span\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal;\"\u003ecollimation screws\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal; color: #000000;\"\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; font-weight: bold;\"\u003eKnobs:\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; font-weight: bold;\"\u003eThreads:\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Stainless steel\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\u003c\/ol\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003eThese knobs will also fit the Celestron 14” SCT with \u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e\u003ca title=\"C14FastarSet\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page27\/page106\/index.html\" style=\"color: #000000;\" target=\"self\"\u003e“Trifid” Fastar secondary and headless set-style collimation screws\u003c\/a\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e. The rotary secondary cover must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; color: #000000;\"\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; color: #000000;\"\u003eDo not adjust the center screw if present; this is the secondary pivot screw.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #000000;\"\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-style: normal; font-variant: normal; font-stretch: normal; font-size: 12px; line-height: normal; font-family: Arial, Verdana, Helvetica, sans-serif; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-language-override: normal; font-feature-settings: normal; font-variation-settings: normal; color: #000000;\"\u003eBob’s Knobs for Celestron 14″ SCT\u003c\/span\u003e\u003c\/p\u003e\n\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e","brand":"Bob's Knobs","offers":[{"title":"Default Title","offer_id":44100639391973,"sku":"BOB-C14metphi","price":36.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-celestron-14-sct-c14metphi-astronomy-plus.webp?v=1690490809"},{"product_id":"bobs-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-6-f-9-ritchey-cretien-secondary-at6rc","title":"Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6\" f\/9 Ritchey-Crétien Secondary (AT6RC)","description":"\u003ch2\u003eBob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6\" f\/9 Ritchey-Crétien Secondary\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e \u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003eAstro-Tech, GSO, iOptron, MallinCam, Orion (US), and TPO 6\" f\/9 RCT secondary (solid or truss-tube)\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; font-weight: bold;\"\u003eKnobs:\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; font-weight: bold;\"\u003eThreads:\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Stainless steel\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003eIf the dust cover cannot be installed because of knob height, you can use a shower cap in its place.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eBob's Knobs for Astro-Tech 6\" f\/9 Ritchey-Crétien Secondary\u003cbr\u003e\u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"Default Title","offer_id":44100660035813,"sku":"BOB-AT6RC","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-6-f9-ritchey-cretien-secondary-at6rc-astronomy-plus.webp?v=1690490819"},{"product_id":"bobs-knobs-for-astro-tech-astro-tech-also-gso-ioptron-mallincam-orion-tpo-8-f-8-ritchey-cretien-secondary-at8rc","title":"Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8\" f\/8 Ritchey-Crétien Secondary (AT8RC)","description":"\u003ch2\u003eBob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8\" f\/8 Ritchey-Crétien Secondary\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Astro-Tech, GSO, iOptron, MallinCam, Orion (US), and TPO 8\" f\/8 RCT secondary (solid or truss-tube)\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIf the dust cover cannot be installed because of knob height, you can use a shower cap in its place.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eBob's Knobs for Astro-Tech 8\" f\/8 Ritchey-Crétien Secondary\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"Default Title","offer_id":44100663410917,"sku":"BOB-AT8RC","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-8-f8-ritchey-cretien-secondary-at8rc-astronomy-plus.webp?v=1690490819"},{"product_id":"bobs-knobs-for-celestron-6-sct-black-oxide-c6bo","title":"Bob's Knobs for Celestron 6” SCT","description":"\u003ch2\u003eBob's Knobs for Celestron 6” SCT \u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003eThe knobs below will fit almost all versions of the Celestron 6” Schmidt-Cassegrain secondary. Price is for a complete set of knobs.\u003cbr\u003e\u003cbr\u003eIMPORTANT NOTE: \u003c\/span\u003e\u003cspan style=\"font: 14px Arial, Verdana, Helvetica, sans-serif;\"\u003eSecondary collimation screws have threads (measured below the screw head) that are either 10 mm or 12 mm long. We include a set of white spacers to be used on the knobs if factory threads are 10 mm long. \u003c\/span\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font: 14px Arial, Verdana, Helvetica, sans-serif;\"\u003eDo NOT use the white spacers if the factory screw threads are 12 mm long\u003c\/span\u003e\u003cspan style=\"font: 14px Arial, Verdana, Helvetica, sans-serif;\"\u003e.\u003c\/span\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 15px; font-weight: bold;\"\u003eA. Knobs for C6 f\/10 Secondary with Metric Collimation Screw Threads\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Celestron 6” (15 cm) f\/10 SCT versions (C6-A-XLT, C6-GT, C6-S, C6-SE, C6-SGT, others)\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; font-weight: bold;\"\u003eKnobs:\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Black oxide steel (black) , 12 mm (1\/2”) diameter\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; font-weight: bold;\"\u003eThreads:\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e Black oxide \u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; color: #000000;\"\u003eAll versions of the Celestron C6 SCT have collimation screws with metric threads.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003eSecondary collimation screws have threads (measured below the screw head) that are either 10 mm or 12 mm long. We include a set of white spacers to be used on the knobs if factory threads are 10 mm long. \u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003eDo NOT use the white spacers if the factory screw threads are 12 mm long\u003c\/span\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e.\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; color: #000000;\"\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common. \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif; color: #000000;\"\u003eThe factory dust cover will usually fit properly with Bob’s Knobs installed, except on some very early versions.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eBob's Knobs for Celestron 6” SCT Black Oxide\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eor\u003c\/p\u003e\n\u003cp\u003eStainless steel\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"A1. Black Oxide Steel (C6BO)","offer_id":46855240024293,"sku":"BOB-C6BO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"A2. Stainless Steel (C6SS)","offer_id":46855240057061,"sku":"BOB-C6SS","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-celestron-6-sct-black-oxide-c6bo-astronomy-plus.jpg?v=1690490820"},{"product_id":"bobs-knobs-for-celestron-9-25-sct","title":"Bob's Knobs for Celestron 9.25” SCT","description":"\u003ch2 data-mce-fragment=\"1\"\u003eBob's Knobs for Celestron 9.25” SCT\u003c\/h2\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e A. Knobs for C9.25 f\/10 Secondary with Standard Collimation Screw Threads\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C9.25std\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 9.25” (23.5 cm) f\/10 SCT versions with standard collimation screw threads. Not for CPC 925 or C9.25 with “Trifid” Faster or EdgeHD optics (see Items B and C below).\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black plastic, 16 mm (5\/8”) diameter\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eThreads:\u003c\/strong\u003e Black anodized aluminum alloy\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003col data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSilver factory collimation screws have standard threads. Our \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page24\/page67\/page67.html\" title=\"C9.25 Hints\" data-mce-fragment=\"1\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page24\/page67\/page67.html\" target=\"self\"\u003ehints\u003c\/a\u003e will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eKnobs include a set of long spacers so they clear the secondary housing lip.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCelestron 9.25” SCTs manufactured prior to 2006 have standard collimation screw threads.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003c\/h4\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e B. Knobs for C9.25 f\/10 Secondary (non-Fastar) with Metric Collimation Screw Threads\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C9.25metBO (black oxide steel); C9.25metSS (stainless steel)\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 9.25” (23.5 cm) f\/10 SCT versions with metric screw threads (CPC 925). Not for C9.25 with “Trifid” Faster or EdgeHD optics (see Item C below).\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr data-mce-fragment=\"1\"\u003eThreads: Black oxide or stainless steel\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003col data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBlack Phillips factory collimation screws usually have metric threads, but some black Phillips screws have standard threads. Our \u003ca title=\"C9.25 Hints\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page24\/page67\/page67.html\" data-mce-fragment=\"1\" target=\"self\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page24\/page67\/page67.html\"\u003ehints\u003c\/a\u003e will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThese knobs sit inside the tall lip around the perimeter of the secondary, so they may be hard to grasp with two fingers. Adjustments can be made using a thumb or finger against the inside edge of the knob.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eIf your telescope has a factory-installed plastic cap over the collimation screws, it must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003ch4\u003eC. Knobs for C9.25 f\/10 Secondary with Metric Collimation Screw Threads and “Trifid” Fastar Housing\u003c\/h4\u003e\n\u003cbr data-mce-fragment=\"1\" data-mce-style=\"color: #666666; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12.48px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C9.25fst\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 9.25” (23.5 cm) f\/10 SCT versions with \"Trifid\" Fastar secondary housing ONLY\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black plastic, 15 mm (5\/8”) diameter\u003cbr data-mce-fragment=\"1\"\u003eThreads: Black oxide steel\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eKnobs with silver screws may come apart if they are over-tightened. We have developed a new design using black screws that have a stronger bond with the knob. If needed, contact us using the link below for free replacement.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003col data-mce-fragment=\"1\" data-mce-style=\"list-style-type: decimal; color: #666666; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12.48px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThese knobs fit only the Celestron 9.25” f\/10 SCT with a Fastar secondary which has black Phillips factory collimation screws that are recessed into the secondary housing. These knobs will fit C9.25 Fastar telescopes with or \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page24\/page-6\/index.html\" title=\"C9.25FastarNonEdge\" data-mce-fragment=\"1\" data-mce-style=\"text-decoration: underline; color: #0080ff;\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page24\/page-6\/index.html\"\u003ewithout\u003c\/a\u003e EdgeHD optics.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCollimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eKnobs include a set of long spacers so they sit slightly above the rotary cover opening. The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Bob's Knobs","offers":[{"title":"A. C9.25std","offer_id":44110846099685,"sku":"BOB-C9.25std","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B. C9.25metBO (black oxide steel)","offer_id":44110846132453,"sku":"BOB-C9.25metBO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B. C9.25metSS (stainless steel)","offer_id":44110866612453,"sku":"BOB-C9.25metSS","price":39.0,"currency_code":"CAD","in_stock":true},{"title":"C. C9.25fst","offer_id":44110846165221,"sku":"BOB-C9.25fst","price":36.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-celestron-9-25-sct-astronomy-plus-1.jpg?v=1690491182"},{"product_id":"bobs-knobs-for-celestron-8-sct","title":"Bob's Knobs for Celestron 8\" SCT","description":"\u003ch2\u003eBob's Knobs for Celestron 8\" SCT\u003c\/h2\u003e\n\u003ch4\u003eA. Knobs for C8 f\/10 Pre-1980 Orange-Tube Secondary\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C8org\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Pre-1980 Celestron 8” (20 cm) f\/10 SCT with orange optical tube and factory set-style collimation screws. These screws can be either Allen or slotted.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs will fit orange tube C8 models made prior to 1980. The secondary has factory set-style collimation screws with a fourth central screw in the secondary housing.\u003c\/li\u003e\n\u003cli\u003eTwo sets of knobs, each with a different screw length, are included with your order. Use the length that fits your telescope best. There should be two or three screw thread turns above the secondary housing and the dust cover should fit without contacting the knobs.\u003c\/li\u003e\n\u003cli\u003eDo not adjust the center screw; this is the secondary pivot screw.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eB. Knobs for C8 f\/10 Post-1980 Secondary with Standard Collimation Screw Threads\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C8std\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 8” (20 cm) f\/10 post-1980 SCT with factory Allen or silver Phillips collimation screws, with or without Fastar secondary with silver collimation screws (C8 black, or gray; Ultima 2000; NexStar 8; many others). This includes the post-2005 orange-tube. Will NOT fit pre-1980 orange tube or most scopes with black Phillips factory collimation screws.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs will fit C8 models made prior to 2005 (except pre-1980 orange tube; see Item A above), and most post-2005 models with silver factory collimation screws.\u003c\/li\u003e\n\u003cli\u003eMost models with black Phillips factory collimation screws require C8 metric knobs (Item C below). However, a few post-2005 scopes have black Phillips collimation screws with standard threads. Here are some hints to help determine which screws your telescope has. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/li\u003e\n\u003cli\u003eWe provide spacers to raise the knobs slightly for easier use, but the spacers can be omitted if the knobs contact the inside of the full-aperture dust cover. Spacers are required for knobs installed on the Fastar secondary with silver collimation screws for proper clearance.\u003c\/li\u003e\n\u003cli\u003eSome telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eC. Knobs for C8 f\/10 Secondary with Metric Collimation Screw Threads (not for EdgeHD or Hyperstar)\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C8metBO (black oxide steel); C8metSS (stainless steel)\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Most Celestron 8” (20 cm) f\/10 SCT made in 2005 and later with black Phillips factory collimation screws that have metric threads. Includes SkyWatcher SCT and non-EdgeHD Fastar. Will NOT fit Celestron telescopes made before 2005.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black oxide or stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMost models with black Phillips factory collimation screws require metric knobs. A few post-2005 scopes have black Phillips collimation screws with standard threads. Here are some hints to help determine which screws your telescope has. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/li\u003e\n\u003cli\u003eSome C8 scopes have metric collimation screws that are 10mm long rather than the more common 8mm, and you should install knobs without the white spacers.\u003c\/li\u003e\n\u003cli\u003eThese knobs will fit the metric Fastar version only if it does NOT have EdgeHD optics. Scopes with EdgeHD optics require different knobs (Item D below).\u003c\/li\u003e\n\u003cli\u003eBlack oxide steel (shown in photos) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/li\u003e\n\u003cli\u003eSome telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eD. Knobs for C8 f\/10 Secondary with EdgeHD Optics\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C8edgBO (black oxide steel); C8edgSS (stainless steel)\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 8” (20 cm) f\/10 SCT with Fastar secondary and EdgeHD optics.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black oxide or stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs will fit only the Celestron 8” SCT with Fastar secondary and EdgeHD optics. These telescopes are marked “EDGEHD OPTICS” on the corrector ring. Do not use these knobs on the non-EdgeHD Fastar secondary; the screws on these knobs are too long. Be sure to check that the thread length on our knobs matches the thread length on the factory collimation screws.\u003c\/li\u003e\n\u003cli\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eE. Knobs for C8 f\/10 Secondary with Hyperstar Conversion Kit and Standard Collimation Screw Threads\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C8stdhyp\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 8” (20 cm) f\/10 SCT with standard collimation screws and the conversion kit for the Hyperstar option\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs are taller than our other standard knobs to compensate for the countersunk factory screws in the Hyperstar secondary conversion kit.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eF. Knobs for C8 f\/10 Secondary with Hyperstar Conversion Kit and Metric Collimation Screw Threads\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C8hypBO (black oxide steel); C8hypSS (stainless steel)\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 8” (20 cm) f\/10 SCT with metric collimation screws and the conversion kit for the Hyperstar option\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr\u003eThreads: Black oxide or stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs are taller than our other metric knobs to compensate for the countersunk factory screws in the Hyperstar secondary conversion kit.\u003c\/li\u003e\n\u003cli\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for C8 f\/10 Pre-1980 Orange-Tube Secondary (C8org)","offer_id":44112174153957,"sku":"BOB-C8org","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B. Knobs for C8 f\/10 Post-1980 Secondary with Standard Collimation Screw Threads (C8std)","offer_id":44112174186725,"sku":"BOB-C8std","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"C. Knobs for C8 f\/10 Secondary with Metric Collimation Screw Threads (not for EdgeHD or Hyperstar) (C8metBO)","offer_id":44112174219493,"sku":"BOB-C8metBO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"C. Knobs for C8 f\/10 Secondary with Metric Collimation Screw Threads (not for EdgeHD or Hyperstar) (C8metSS)","offer_id":44112174252261,"sku":"BOB-C8metSS","price":39.0,"currency_code":"CAD","in_stock":true},{"title":"D. Knobs for C8 f\/10 Secondary with EdgeHD Optics (C8edgBO)","offer_id":44112174285029,"sku":"BOB-C8edgBO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"D. Knobs for C8 f\/10 Secondary with EdgeHD Optics (C8edgSS)","offer_id":44112174317797,"sku":"BOB-C8edgSS","price":39.0,"currency_code":"CAD","in_stock":true},{"title":"E. Knobs for C8 f\/10 Secondary with Hyperstar Conversion Kit and Standard Collimation Screw Threads (C8stdhyp)","offer_id":44112174350565,"sku":"BOB-C8stdhyp","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"F. Knobs for C8 f\/10 Secondary with Hyperstar Conversion Kit and Metric Collimation Screw Threads (C8hypBO)","offer_id":44112174383333,"sku":"BOB-C8hypBO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"F. Knobs for C8 f\/10 Secondary with Hyperstar Conversion Kit and Metric Collimation Screw Threads (C8hypSS)","offer_id":44112174416101,"sku":"BOB-C8hypSS","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-celestron-8-sct-astronomy-plus.webp?v=1690491211"},{"product_id":"bobs-knobs-for-celestron-5-sct","title":"Bob's Knobs for Celestron 5\" SCT","description":"\u003ch2\u003eBob's Knobs for Celestron 5\" SCT\u003c\/h2\u003e\n\u003ch4\u003eA. Knobs for C5 f\/10 Secondary with Standard Collimation Screw ThreadsPart\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cstrong\u003ePart\u003c\/strong\u003e: C5std\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 5” (13 cm) f\/10 SCT (C5, NexStar 5) with black Allen, silver Allen, or silver Phillips factory collimation screws. These screws have standard threads. Will NOT fit scopes with black Phillips factory collimation screws (see Item B below).\u003cbr\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs will fit all C5 models made prior to 2006, and all 2006 and later models EXCEPT those with black Phillips factory collimation screws. The black Phillips screw model requires C5 metric knobs (Item B beolw). Check that our screw threads match the factory screw threads before installing.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003cli\u003eSome telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003eB. Knobs for C5 f\/10 Secondary with Metric Collimation Screw Threads\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C5metBO (black oxide steel); C5metSS (stainless steel)\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 5” (13 cm) f\/10 SCT (C5, NexStar 5SE, Omni 127) with black Phillips factory collimation screws. These screws have metric threads. Will NOT fit scopes with silver factory collimation screws (see Item A above).\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black oxide or stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs will fit only 2006 and later C5 models that have black Phillips factory collimation screws. All C5 models made prior to 2006 and all post-2006 models with black Allen or silver factory collimation screws require C5 standard knobs (Item A above). Check that our screw threads match the factory screw threads before installing.\u003c\/li\u003e\n\u003cli\u003eSome C5 scopes have metric collimation screws that are 10mm long rather than the more common 8mm. If your secondary looks like this, you have screws with 10mm thread length and you should install knobs without the white spacers.\u003c\/li\u003e\n\u003cli\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/li\u003e\n\u003cli\u003eSome telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003eC. Knobs for C5 f\/6 Secondary with Standard Collimation Screw Threads (rare)\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePart\u003c\/strong\u003e: C5f6\u003cbr\u003e\u003cstrong\u003eFits\u003c\/strong\u003e: Celestron 5” (13 cm) f\/6 SCT only. Will not fit the Celestron 5” f\/10 SCT.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKnobs\u003c\/strong\u003e: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003e\u003cstrong\u003eThreads\u003c\/strong\u003e: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThese knobs will fit only the rare C5 f\/6 telescope. If your secondary looks like this, you have the f\/6 version.\u003c\/li\u003e\n\u003cli\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for C5 f\/10 Secondary with Standard Collimation Screw ThreadsPart (C5std)","offer_id":44114259345637,"sku":"BOB-C5std","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"B1. Knobs for C5 f\/10 Secondary with Metric Collimation Screw Threads Black Oxide Steel (C5metBO)","offer_id":44114259378405,"sku":"BOB-C5metBO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B2. Knobs for C5 f\/10 Secondary with Metric Collimation Screw Threads Stainless Steel(C5metSS)","offer_id":44114259411173,"sku":"BOB-C5metSS","price":39.0,"currency_code":"CAD","in_stock":true},{"title":"C. Knobs for C5 f\/6 Secondary with Standard Collimation Screw Threads (C5f6)","offer_id":44114259443941,"sku":"BOB-C5f6","price":28.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-celestron-5-sct-astronomy-plus.webp?v=1690491231"},{"product_id":"bobs-knob-for-common-newtonian-primary","title":"Bob's Knob for Common Newtonian Primary (Starfield  \u0026 GSO 6\" to 16\")","description":"\u003ch2\u003eBob's Knob for Common Newtonian Primary\u003c\/h2\u003e\n\u003cp\u003eCommon Newtonian-style telescope primary configurations: These knobs will fit most Newtonian reflectors made by Guan Sheng Optical, including GSO, Hardin Optical, Meade, and Zhumell models, provided the telescope has \u003ca title=\"MLBFactoryScrews\" href=\"http:\/\/www.bobsknobs.com\/Newt\/styled-2\/page127\/index.html\"\u003efactory primary collimation screws\u003c\/a\u003e. If your telescope has \u003ca title=\"MLBFactoryKnobs\" href=\"http:\/\/www.bobsknobs.com\/Newt\/styled-2\/page36\/index.html\"\u003efactory primary collimation knobs\u003c\/a\u003e, these knobs will not fit because the factory knobs have a different diameter.\u003cbr\u003e\u003cbr\u003eOur knobs listed here have a screw diameter of 7 mm (collimation) and 6 mm (locking), and will usually fit your telescope if you select the knobs that match your scope’s aperture. If your screws are different, we can design \u003cu\u003e\u003ca title=\"Custom Knobs\" href=\"http:\/\/www.bobsknobs.com\/page59\/custom.html\"\u003ecustom knobs\u003c\/a\u003e\u003c\/u\u003e for your application. Contact us using the link at the bottom of this page for more information. Price is for a complete set of knobs.\u003cbr\u003e\u003cbr\u003eWe also offer stronger primary mirror support springs so collimation is retained while the locking screws are backed off for collimation adjustment. See Item D below. Price is for a complete set of springs.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eA. Knobs for Common Newtonian 8” Primary\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e\u003cspan\u003e 8” \u003c\/span\u003e\u003cspan\u003eNewtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePrimary collimation\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"dashed\"\u003e\n\u003cli\u003e\n\u003cspan\u003eKnobs:\u003c\/span\u003e\u003cspan\u003e Black plastic, 30 mm (1-1\/4”) diameter, 5-point fluted\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThreads:\u003c\/span\u003e\u003cspan\u003e Plated steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePrimary Lock\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"dashed\"\u003e\n\u003cli\u003e\n\u003cspan\u003eKnobs: \u003c\/span\u003e\u003cspan\u003eBlack plastic, 25 mm (1”) diameter, knurled\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThreads:\u003c\/span\u003e\u003cspan\u003e Stainless steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThese knobs will fit telescopes with M7 (7 mm diameter) primary adjustment screws and M6 (6 mm diameter) primary lock screws. These knobs will not fit 8” GSO telescopes that have M5 (5 mm diameter) primary adjustment screws.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp style=\"text-align: left;\" data-mce-style=\"text-align: center;\"\u003e\u003cspan\u003e_____________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eB. Knobs for Common Newtonian 10” Primary\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e 10” Newtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.\u003cstrong\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003ePrimary collimation\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"dashed\"\u003e\n\u003cli\u003e\n\u003cspan\u003eKnobs:\u003c\/span\u003e\u003cspan\u003e Black plastic, 30 mm (1-1\/4”) diameter, 5-point fluted\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThreads:\u003c\/span\u003e\u003cspan\u003e Plated steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePrimary Lock\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"dashed\"\u003e\n\u003cli\u003e\n\u003cspan\u003eKnobs: \u003c\/span\u003e\u003cspan\u003eBlack plastic, 25 mm (1”) diameter, knurled\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThreads:\u003c\/span\u003e\u003cspan\u003e Stainless steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: left;\" data-mce-style=\"text-align: center;\"\u003e\u003cspan\u003e_____________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eC. Knobs for Common Newtonian 12” Primary\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003cspan\u003e 12” \u003c\/span\u003e\u003cspan\u003eNewtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003ePrimary collimation\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"dashed\"\u003e\n\u003cli\u003e\n\u003cspan\u003eKnobs:\u003c\/span\u003e\u003cspan\u003e Black plastic, 30 mm (1-1\/4”) diameter, 5-point fluted\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThreads:\u003c\/span\u003e\u003cspan\u003e Plated steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePrimary Lock\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"dashed\"\u003e\n\u003cli\u003e\n\u003cspan\u003eKnobs: \u003c\/span\u003e\u003cspan\u003eBlack plastic, 25 mm (1”) diameter, knurled\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThreads:\u003c\/span\u003e\u003cspan\u003e Stainless steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eIn the Box :\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eKnob for selected primary Newtonian mirror size :\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFor Newtonian 8\" Primary\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFor Newtonian 10\" Primary\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFor Newtonian 12\" Primary\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bob's Knobs","offers":[{"title":"For Newtonian 8\"","offer_id":44180599210213,"sku":"BOB-MLB8pri","price":49.0,"currency_code":"CAD","in_stock":true},{"title":"For Newtonian 10\"","offer_id":44180599406821,"sku":"BOB-MLB10pri","price":49.0,"currency_code":"CAD","in_stock":true},{"title":"For Newtonian 12\"","offer_id":44180599439589,"sku":"BOB-MLB12pri","price":49.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/products\/bob-s-knob-for-common-newtonian-primary-astronomy-plus-1.jpg?v=1715808972"},{"product_id":"bobs-knob-telescope-collimation-thumbscrews-for-meade-lightbridge-8-inch-primary","title":"Bob's Knob telescope collimation thumbscrews for Meade Lightbridge 8 inch primary","description":"","brand":"Astronomy Plus","offers":[{"title":"Default Title","offer_id":44574197711077,"sku":"BOB-LIGHTBRIDGE-PRIMARY","price":10.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/8888.jpg?v=1777043226"},{"product_id":"bobs-knobs-for-celestron-11-sct","title":"Bob's Knobs for Celestron 11\" SCT","description":"\u003ch2\u003eBob's Knobs for Celestron 11\" SCT\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe offer knobs for all versions of the Celestron 11” f\/10 Schmidt-Cassegrain secondary with either standard or metric collimation screws, including Fastar, non-Fastar, and EdgeHD versions. Select knobs for your telescope from the list below.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSpecial Note:\u003c\/strong\u003e The Celestron 11” SCT uses either standard 6-32 or metric M3 collimation screws. Allen, most silver Phillips, and set-style factory collimation screws have standard threads. Most black Phillips screws are metric. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eA. Knobs for C11 f\/10 with Flat Secondary Housing and Standard Collimation Screw Threads\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C11std\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 11” (28 cm) f\/10 SCT versions (metal or carbon fiber tube) with flat secondary housing and standard collimation screw threads (not for CPC 1100 or EdgeHD). Does not fit the Starizona Hyperstar secondary (see Item C below).\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page100\/index.html\" title=\"C11SilverPhillips\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page100\/index.html\"\u003eSilver factory collimation screws\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e usually have standard threads, but some silver Phillips screws have metric threads. Our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" title=\"C11 Hints\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" target=\"self\"\u003ehints\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCelestron 11” SCTs manufactured prior to 2006 have standard collimation screw threads.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eB. Knobs for C11 f\/10 with Flat Secondary Housing (non-Fastar) and Metric Collimation Screw Threads\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C11metBO (black oxide steel); C11metSS (stainless steel)\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 11” (28 cm) f\/10 SCT versions with flat secondary housing and metric collimation screw threads (most CPC 1100). Does not fit the Starizona Hyperstar secondary (see Item D below).\u003cbr\u003e\u003cbr\u003eKnobs: Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr\u003eThreads: Black oxide or stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page99\/index.html\" title=\"C11BlackPhillips\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page99\/index.html\"\u003eBlack Phillips factory collimation screws\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e usually have metric threads, but some black Phillips screws have standard threads. Our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" title=\"C11 Hints\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" target=\"self\"\u003ehints\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIf your telescope has a factory-installed plastic cap over the collimation screws, it must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e(Black oxide steel)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eC. Knobs for C11 f\/10 with “Trifid” Fastar Secondary Housing and Standard Collimation Screw Threads - (NOT EdgeHD)\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C11stdfst\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 11” (28 cm) f\/10 SCT versions (metal or carbon fiber tube) with standard thread factory collimation screws and \u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page101\/index.html\" title=\"C11FastarSilver\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page101\/index.html\" target=\"self\"\u003e\"Trifid\" rotary cover Fastar secondary housing\u003c\/a\u003e\u003c\/u\u003e. Factory collimation screws are silver Phillips. These knobs will also fit the \u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page102\/index.html\" title=\"C11Hyperstar\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page102\/index.html\" target=\"self\"\u003eC11 with Starizona Hyperstar\u003c\/a\u003e\u003c\/u\u003e only if the collimation screws have standard threads.\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\n\u003cspan\u003eThese telescopes can have factory collimation screws with either standard or metric threads. Silver Phillips collimation screws are standard thread. Some black Phillips collimation screws are also standard thread. See our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" title=\"C11 Hints\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" target=\"self\"\u003ehints\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e for more information. If you discover your knobs have the wrong threads, you can return them for a refund and order the correct knobs. Alternatively, you can order knobs with both standard and metric thread screws and return the unused set for a full refund.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eD. Knobs for C11 f\/10 with Fastar Secondary Housing and Metric Collimation Screw Threads - (Edge HD)\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C11metfst\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 11” (28 cm) f\/10 SCT versions (metal or carbon fiber tube) with metric thread factory collimation screws and Fastar secondary housing. This housing can have either a \u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page134\/index.html\" title=\"C11FastarBlackTrifid\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page134\/index.html\"\u003e\"Trifid\" rotary cover\u003c\/a\u003e\u003c\/u\u003e or a \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page-2\/index.html\" title=\"C11FastarBlackKnob\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page-2\/index.html\"\u003esimple knob in the center\u003c\/a\u003e and no rotary cover. Factory collimation screws are black Phillips. These knobs will fit the \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page103\/index.html\" title=\"C11EdgeHD\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page103\/index.html\" target=\"self\"\u003eC11 with EdgeHD optics\u003c\/a\u003e. They will also fit the \u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page102\/index.html\" title=\"C11Hyperstar\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page102\/index.html\" target=\"self\"\u003eC11 with Starizona Hyperstar\u003c\/a\u003e\u003c\/u\u003e only if the collimation screws have metric threads.\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Black oxide steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\n\u003cspan\u003eThese telescopes can have factory collimation screws with either standard or metric threads. Most models with black Phillips collimation screws have metric threads. There are a few black Phillips screws with standard threads. See our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" title=\"C11 Hints\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page25\/page51\/C11hints.html\" target=\"self\"\u003ehints\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e for more information. If you discover your knobs have the wrong threads, you can return them for a refund and order the correct knobs. Alternatively, you can order knobs with both standard and metric thread screws and return the unused set for a full refund.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCollimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIf your telescope has a rotary secondary cover, it must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSPECIAL NOTE: If your dust cover will not stay in place due to knob interference, contact us using the link below and we will send you knobs with a lower profile.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for C11 f\/10 with Flat Secondary Housing and Standard Threads","offer_id":44822523445477,"sku":"BOB-C11std","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B1. Knobs for C11 f\/10 with Flat Secondary Housing (non-Fastar) and Metric Threads","offer_id":44822523478245,"sku":"BOB-C11metBO","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B2. Knobs for C11 f\/10 with Flat Secondary Housing (NF) and Metric - Stainless Steel","offer_id":46855215120613,"sku":"BOB-C11SS","price":39.0,"currency_code":"CAD","in_stock":true},{"title":"C. Knobs for C11 f\/10  with Fastar and Standard Threads (NOT Edge HD)","offer_id":44822523511013,"sku":"BOB-C11stdfst","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"D. Knobs for C11 f\/10 with Fastar Secondary Housing and Metric Threads (Edge HD)","offer_id":44822523543781,"sku":"BOB-C11metfst","price":36.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bob-s-knobs-for-celestron-11-sct-astronomy-plus-1.jpg?v=1715808170"},{"product_id":"bobs-knobs-for-meade-6-sct","title":"Bob's Knobs for Meade 6\" SCT","description":"\u003ch2\u003eBob's Knobs for Meade 6\" SCT\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe knobs below will fit all versions of the Meade 6” Schmidt-Cassegrain secondary. Price is for a complete set of knobs.\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M6-6\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 6” (15 cm) f\/10 SCT versions (ETX-LS, LS-6 SC and ACF, LT-6 SC and ACF)\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eKnobs: Stainless steel, 12 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNotes:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit properly with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAll Meade 6” f\/10 SCT have the 6-screw secondary. See our \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca href=\"http:\/\/bobsknobs.com\/faq\/faq.html\" title=\"FAQ\" target=\"self\"\u003eFAQ\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca href=\"http:\/\/bobsknobs.com\/page82\/index.html\" title=\"Literature\" target=\"self\"\u003etechnical paper\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e for additional information on installing Bob's Knobs on Meade telescopes with six factory secondary screws.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c!----\u003e","brand":"Bob's Knobs","offers":[{"title":"Default Title","offer_id":45709177749733,"sku":"BOB-M6-6","price":42.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_61602647-ec68-4d07-a232-56104dd8cc99.jpg?v=1777043363"},{"product_id":"bobs-knobs-for-meade-8-20-cm-sct","title":"Bob's Knobs for MEADE 8” (20 cm) SCT","description":"\u003ch2\u003eBob's Knobs for MEADE 8” (20 cm) SCT\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe offer knobs for all versions of the Meade 8” f\/10 and f\/6.3 Schmidt-Cassegrain secondary, including those with three, four, and six secondary screws. (The extra screws on the four- and six-screw versions are for secondary disassembly, not collimation.) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSelect knobs for your telescope from the list below. \u003c\/span\u003e\u003cstrong\u003ePlease use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable.\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003ePrice is for a complete set of knobs.\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eA. Knobs for Meade 8” f\/10 with 3-Screw Secondary\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M8-3\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 8” (20 cm) f\/10 SCT versions with \u003cu\u003e\u003ca title=\"M8-3Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page110\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page110\/index.html\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e (2080, LX5, LX10, LX50, LX90, LX100, LX200, others)\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover may contact the knobs when installed. We provide a set of spacers that attach to the inside of the dust cover to move it slightly away from the secondary assembly. You can also press the center of the cover from the inside to contour it for additional clearance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSome post-2004 Meade 8” telescopes have \u003c\/span\u003e\u003cspan\u003e\u003ca title=\"M8-4Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page111\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page111\/index.html\" target=\"self\"\u003efour screws\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e or \u003c\/span\u003e\u003cspan\u003e\u003ca title=\"M8-6Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page112\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page112\/index.html\" target=\"self\"\u003esix screws\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e on the secondary housing. The 4-screw and 6-screw secondary require different knobs (Items B and C below) Do not use knobs for the 3-screw secondary on the 4-screw or 6-screw secondary. The screws on 3-screw knobs are too short.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSome very early Meade 8” model 2080 telescopes have \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"M8-2Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page114\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page114\/index.html\" target=\"self\"\u003etwo collimation screws\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e. Please contact us using the link at the bottom of this page for knobs to fit this scope.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eB. Knobs for Meade 8” f\/10 with 4-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M8-4\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 8” (20 cm) f\/10 SCT versions with \u003cu\u003e\u003ca title=\"M8-4Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page111\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page111\/index.html\" target=\"self\"\u003efour screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e (LX90, LX200, others).\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\/Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eTwo sets of knobs, each with a different screw thread length, are included with your order. Use the thread length (measured below the white spacer) that matches the factory screw thread length.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover should fit normally with Bob's Knobs installed. If your dust cover contacts the knobs, we provide a set of spacers that attach to the inside of the dust cover to move it slightly away from the secondary assembly. Contact us for a free set. You can also press the center of the cover from the inside to contour it for additional clearance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003ePre-2005 Meade 8” telescopes have \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"M8-3Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page110\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page110\/index.html\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e and no fourth screw on the side. The surface of the 3-screw secondary is textured, not smooth like the surface of the 4-screw secondary pictured. The 3-screw secondary requires different knobs (Item A above).\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eC. Knobs for Meade 8” f\/10 with 6-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M8-6\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 8” (20 cm) f\/10 SCT versions with \u003cu\u003e\u003ca title=\"M8-6Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page112\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page112\/index.html\" target=\"self\"\u003esix screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e (LX90, LX200, LX200ACF, LX200R, LS-8 SC and ACF, LT-8 SC and ACF, others). The inner screws are for collimation.\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover fits normally with Bob's Knobs installed on most versions. If your dust cover contacts the knobs, we provide a set of spacers that attach to the inside of the dust cover to move it slightly away from the secondary assembly. Contact us for a free set. You can also press the center of the cover from the inside to contour it for additional clearance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSee our \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"FAQ\" href=\"http:\/\/bobsknobs.com\/faq\/faq.html\" data-mce-href=\"http:\/\/bobsknobs.com\/faq\/faq.html\" target=\"self\"\u003eFAQ\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"Literature\" href=\"http:\/\/bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\" data-mce-href=\"http:\/\/bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\" target=\"self\"\u003etechnical paper\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e for additional information on installing Bob's Knobs on Meade telescopes with six factory secondary screws.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eYour user manual from Meade may claim that the outer secondary screws are for collimation adjustment. This is incorrect. The inner screws (with knobs in our photo) are collimation screws. The outer screws are for disassembling the secondary.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003ePre-2005 Meade 8” telescopes have \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"M8-3Factory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page110\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page110\/index.html\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e. The 3-screw secondary requires different knobs (Item A above). Do not use knobs for the 6-screw secondary on the 3-screw secondary. The screws on the 6-screw knobs are too long.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e__________________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eD. Knobs for Meade 8” f\/6.3 Widefield Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M8wf\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 8” (20 cm) f\/6.3 SCT versions (2080, LX6, LX10, LX50, LX100, LX200) which are marked \u003ca title=\"M8wfFactory\" href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page113\/index.html\" data-mce-href=\"http:\/\/bobsknobs.com\/SCT\/page34\/page113\/index.html\" target=\"self\"\u003ef\/6.3 WIDE-FIELD\u003c\/a\u003e (or a variation of this) on the corrector ring\u003cbr\u003e\u003cbr\u003eKnobs: Stainless steel, 12 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eSince the factory dust cover contacts the secondary housing when installed, additional clearance is needed to make room for the knobs. We provide a set of spacers that attach to the inside of the dust cover to move it slightly away from the secondary assembly. You can also press the center of the cover from the inside to contour it for additional clearance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for Meade 8” f\/10 with 3-Screw Secondary","offer_id":45709234864357,"sku":"BOB-M8-3","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"B. Knobs for Meade 8” f\/10 with 4-Screw Secondary","offer_id":45709234897125,"sku":"BOB-M8-4","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"C. Knobs for Meade 8” f\/10 with 6-Screw Secondary","offer_id":45709234929893,"sku":"BOB-M8-6","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"D. Knobs for Meade 8” f\/6.3 Widefield Secondary","offer_id":45709234962661,"sku":"BOB-M8wf","price":49.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/m8-3-2.jpg?v=1777043363"},{"product_id":"bobs-knobs-for-meade-10-25-cm-sct","title":"Bob's Knobs for MEADE 10” (25 cm) SCT","description":"\u003ch2\u003e\u003cspan\u003eBob's Knobs for MEADE 10” (25 cm) SCT\u003cbr\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe offer knobs for all versions of the Meade 10” f\/10 and f\/6.3 Schmidt-Cassegrain secondary, including those with three and six secondary screws. (The extra screws on the six-screw version are for secondary disassembly, not collimation.).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e Select knobs for your telescope from the list below. \u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePlease use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable\u003c\/strong\u003e.\u003c\/span\u003e\u003cspan\u003e Price is for a complete set of knobs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eA. Knobs for Meade 10” f\/10 with 3-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M10-3\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 10” (25 cm) f\/10 SCT versions with \u003cu\u003e\u003ca title=\"M10-3Factory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page115\/index.html\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page115\/index.html\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e (2120, LX10, LX50, LX90, LX100, LX200, others)\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSome post-2004 Meade 10” telescopes have \u003c\/span\u003e\u003cspan\u003e\u003ca title=\"M10-6Factory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page116\/index.html\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page116\/index.html\" target=\"self\"\u003esix screws\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e on the secondary housing. The 6-screw secondary requires different knobs (Item B below) Do not use knobs for the 3-screw secondary on the 6-screw secondary. The screws on 3-screw knobs are too short.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h4\u003e\n\u003ch4\u003e\u003cspan\u003eB. Knobs for Meade 10” f\/8 and f\/10 with 6-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M10-6\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 10” (25 cm) f\/8 and f\/10 SCT versions with \u003cu\u003e\u003ca title=\"M10-6Factory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page116\/index.html\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page116\/index.html\" target=\"self\"\u003esix screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e (LX90, LX200, LX200ACF, LX200R, others). The inner screws are for collimation.\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSee our \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"FAQ\" href=\"http:\/\/www.bobsknobs.com\/faq\/faq.html\" data-mce-href=\"http:\/\/www.bobsknobs.com\/faq\/faq.html\" target=\"self\"\u003eFAQ\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"Literature\" href=\"http:\/\/www.bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\" data-mce-href=\"http:\/\/www.bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\" target=\"self\"\u003etechnical paper\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e for additional information on installing Bob's Knobs on Meade telescopes with six factory secondary screws.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003ePre-2005 Meade 10” telescopes have \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca title=\"M10-3Factory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page115\/index.html\" data-mce-href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page115\/index.html\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e. The 3-screw secondary requires different knobs (Item A above). Do not use knobs for the 6-screw secondary on the 3-screw secondary. The screws on the 6-screw knobs are too long.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eC. Knobs for Meade 10” f\/6.3 Widefield Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M10wf\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 10 inch (25 cm) f\/6.3 SCT versions (2120, LX10, LX50, LX100, LX200) which are marked \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page35\/page117\/index.html\" title=\"M10wfFactory\" target=\"self\"\u003ef\/6.3 WIDE-FIELD\u003c\/a\u003e on the corrector ring (Meade 8” f\/6.3 is shown in the link)\u003cbr\u003e\u003cbr\u003eKnobs: Stainless steel, 12 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eSince the factory dust cover contacts the secondary housing when installed, additional clearance is needed to make room for the knobs. We provide a set of spacers that attach to the inside of the dust cover to move it slightly away from the secondary assembly. You can also press the center of the cover from the inside to contour it for additional clearance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for Meade 10” f\/10 with 3-Screw Secondary","offer_id":45709316948197,"sku":"BOB-M10-3","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B. Knobs for Meade 10” f\/8 and f\/10 with 6-Screw Secondary","offer_id":45709316980965,"sku":"BOB-M10-6","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"C. Knobs for Meade 10” f\/6.3 Widefield Secondary","offer_id":45709317013733,"sku":"BOB-M10wf","price":49.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/m10-3-2.jpg?v=1777043364"},{"product_id":"bobs-knobs-for-meade-12-30-cm-sct","title":"Bob's knobs for MEADE 12” (30 cm) SCT","description":"\u003ch2\u003eBob's knobs for MEADE 12” (30 cm) SCT\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe offer knobs for all versions of the Meade 12” f\/10 and f\/8 Schmidt-Cassegrain secondary, including those with three, four, and six secondary screws. (The extra screws on the four- and six-screw versions are for secondary disassembly, not collimation.) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSelect knobs for your telescope from the list below. \u003c\/span\u003e\u003cstrong\u003ePlease use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable.\u003c\/strong\u003e\u003cspan\u003e Price is for a complete set of knobs.\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eA. Knobs for Meade 12” f\/10 with 3-Screw or 4-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M12-3\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 12” (30 cm) f\/10 SCT versions with \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page30\/page118\/index.html\" title=\"M12-3Factory\" target=\"self\"\u003ethree screws\u003c\/a\u003e or \u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page30\/page120\/index.html\" title=\"M12-4Factory\" target=\"self\"\u003efour screws\u003c\/a\u003e\u003c\/u\u003e on the secondary housing (LX200, ACF f\/10, others)\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit properly with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIf your secondary housing has a \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page30\/page120\/index.html\" title=\"M12-4Factory\" target=\"self\"\u003efourth screw on the side\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e, it is for secondary disassembly and is not used for collimation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eB. Knobs for Meade 12” f\/8 with 6-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M12-6f8\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 12” (30 cm) f\/8 SCT versions with \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page30\/page119\/index.html\" title=\"M12f8-6Factory\" target=\"self\"\u003esix screws on the secondary housing\u003c\/a\u003e (LX600, LX850, ACF f\/8 versions)\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit properly with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eInstallation may require removing the secondary from the OTA. See our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\"\u003etechnical paper\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e for details.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for Meade 12” f\/10 with 3-Screw or 4-Screw Secondary","offer_id":45709360300261,"sku":"BOB-M12-3","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B. Knobs for Meade 12” f\/8 with 6-Screw Secondary","offer_id":45709360333029,"sku":"BOB-M12-6f8","price":32.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/m12-3-2.jpg?v=1777043365"},{"product_id":"bobs-knobs-for-meade-14-36-cm-sct","title":"Bob's Knobs for MEADE 14” (36 cm) SCT","description":"\u003ch2\u003eBob's Knobs for MEADE 14” (36 cm) SCT\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe offer knobs for the Meade 14” f\/10 (\u003c\/span\u003e\u003cspan\u003eItem A\u003c\/span\u003e\u003cspan\u003e) and f\/8 (\u003c\/span\u003e\u003cspan\u003eItem B\u003c\/span\u003e\u003cspan\u003e) Schmidt-Cassegrain secondary with exposed collimation screws. These telescopes have six secondary screws. The three inner screws are for collimation. The three outer screws are for secondary disassembly, not collimation. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe do not offer knobs for the very early Meade 14” f\/10 Schmidt-Cassegrain telescope with recessed factory collimation screws \u003cstrong\u003e(\u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003eItem C). Please use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable.\u003c\/strong\u003e\u003cspan\u003e Price is for a complete set of knobs.\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eA. Knobs for Meade 14” f\/10 with 6-Screw Secondary and Exposed Factory Collimation Screws\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M14-6e\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 14” (36 cm) f\/10 SCT versions with 6-screw secondary and  \u003cu\u003e\u003ca title=\"M14-6eFactory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page31\/page121\/index.html\" target=\"self\"\u003eexposed factory collimation screws\u003c\/a\u003e\u003c\/u\u003e (Includes LX200ACF, LX600, LX850)\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThese knobs are for the f\/10 version only. See Item B (below) for f\/8 knobs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit properly with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eInstallation may require removing the secondary from the OTA. See our \u003c\/span\u003e\u003cspan\u003etechnical paper\u003c\/span\u003e\u003cspan\u003e for details.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eB. Knobs for Meade 14” f\/8 with 6-Screw Secondary and Exposed Factory Collimation Screws\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M14-6f8\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 14” (36 cm) f\/8 SCT versions with 6-screw secondary and  \u003cu\u003e\u003ca title=\"M14-6eFactory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page31\/page121\/index.html\" target=\"self\"\u003eexposed factory collimation screws\u003c\/a\u003e\u003c\/u\u003e (Includes LX200ACF, LX600, LX850)\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 16 mm (5\/8”) diameter\u003cbr\u003eThreads: Black anodized aluminum alloy\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThese knobs are for the f\/8 version only. See Item A (above) for f\/10 knobs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit properly with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eInstallation may require removing the secondary from the OTA. See our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\"\u003etechnical paper\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e for details..\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eC. Meade 14” f\/10 with 6-Screw Secondary and Recessed Factory Collimation Screws\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cdiv id=\"container\"\u003e\n\u003cdiv id=\"contentContainer\"\u003e\n\u003cdiv id=\"content\"\u003eEarly Meade 14” f\/10 SCTs have\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"M14-6RecessedFactory\" href=\"http:\/\/www.bobsknobs.com\/SCT\/page31\/page122\/index.html\"\u003erecessed collimation screws\u003c\/a\u003e, as shown in the photograph. These headless set screws are located near the perimeter of the secondary and are accessed through notches in the cover plate.\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWe do not offer knobs for these scopes because they would be in the light path.\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"clearer\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"footer\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg height=\"312\" width=\"312\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/m14-6recessed-2.jpg?v=1717784261\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for Meade 14” f\/10 with 6-Screw Secondary and Exposed Factory Collimation Screws","offer_id":45709527777509,"sku":"BOB-M14-6e","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"B. Knobs for Meade 14” f\/8 with 6-Screw Secondary and Exposed Factory Collimation Screws","offer_id":45709527810277,"sku":"BOB-M14-6f8","price":32.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/m14-6e-2.jpg?v=1777043366"},{"product_id":"bobs-knobs-meade-16-41-cm-sct","title":"Bob's Knobs for MEADE 16” (41 cm) SCT","description":"\u003ch2\u003eBob's Knobs for MEADE 16” (41 cm) SCT\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe offer knobs for all versions of the Meade 16” f\/10 Schmidt-Cassegrain secondary, including those with three and six secondary screws. (The extra screws on the six-screw version are for secondary disassembly, not collimation.) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSelect knobs for your telescope from the list below. \u003c\/span\u003e\u003cstrong\u003ePlease use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable.\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003ePrice is for a complete set of knobs.\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eA. Knobs for Meade 16” f\/10 with 3-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M16-3\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 16” (41 cm) f\/10 SCT versions with \u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page32\/page123\/index.html\" title=\"M16-3Factory\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003eKnobs: Stainless steel, 19 mm (3\/4”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eLater Meade 16” telescopes have \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page32\/page124\/index.html\" title=\"M16-6Factory\" target=\"self\"\u003esix screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e. These scopes require different knobs (Item B below). Do not use knobs for the 3-screw secondary on the 6-screw secondary. The screws on the 3-screw knobs are too long.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan\u003e_______________________________\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eB. Knobs for Meade 16” f\/8 ACF and f\/10 with 6-Screw Secondary\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e M16-6\u003cbr\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Meade 16” (41 cm) f\/8 and f\/10 SCT versions with \u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page32\/page124\/index.html\" title=\"M16-6Factory\" target=\"self\"\u003esix screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e. (Includes LX200ACF, LX800) The inner screws are for collimation.\u003cbr\u003e\u003cbr\u003eKnobs: Stainless steel, 19 mm (3\/4”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\u003cspan\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eInstallation may require removing the secondary from the OTA. See our \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/resources\/Literature\/M6screwinfo4.pdf\"\u003etechnical paper\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e for details.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eEarlier Meade 16 inch (41 cm) telescopes have \u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003ca href=\"http:\/\/www.bobsknobs.com\/SCT\/page32\/page123\/index.html\" title=\"M16-3Factory\" target=\"self\"\u003ethree screws on the secondary housing\u003c\/a\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e. These scopes require different knobs (Item A above). Do not use knobs for the 6-screw secondary on the 3-screw secondary. The screws on the 6-screw knobs are too short.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn Allen wrench for removing the factory collimation screws is included with your order.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Bob's Knobs","offers":[{"title":"A. Knobs for Meade 16” f\/10 with 3-Screw Secondary","offer_id":45709546422501,"sku":"BOB-M16-3","price":56.0,"currency_code":"CAD","in_stock":true},{"title":"B. Knobs for Meade 16” f\/8 ACF and f\/10 with 6-Screw Secondary","offer_id":45709546455269,"sku":"BOB-M16-6","price":56.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/m16-3-2.jpg?v=1777043366"},{"product_id":"bobs-knobs-for-sky-watcher-quattro-newtonian","title":"Bob's Knobs for Sky Watcher Quattro Newtonian Secondary Mirror","description":"\u003ch2\u003eBob's Knobs for Sky Watcher Quattro Newtonian\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eWe offer knobs for the SkyWatcher Quattro Newtonian secondary. The Quattro primary is already equipped with factory collimation knobs. Select the type of knobs for your telescope from the list below. Price is for a complete set of knobs.\u003cbr\u003e\u003cstrong\u003e\u003cbr\u003eA. Knobs for SkyWatcher Quattro 150 and 200 Newtonian Secondary\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"image-right\"\u003e\u003cimg class=\"imageStyle\" alt=\"SWQ150\" src=\"https:\/\/www.bobsknobs.com\/Newt\/styled-6\/files\/SWQ150.jpg\" width=\"173\" height=\"173\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003ePart: CNsec30FT\u003cbr\u003eFits: SkyWatcher Quattro 150 and 200 Newtonian telescope secondary\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e______________________________________\u003cbr\u003e\u003cbr\u003eB. Knobs for SkyWatcher Quattro 250 Newtonian Secondary\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"image-right\"\u003e\u003cimg class=\"imageStyle\" alt=\"SWQ300\" src=\"https:\/\/www.bobsknobs.com\/Newt\/styled-6\/files\/swq300.jpg\" width=\"173\" height=\"173\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003ePart: CNsec40 or CNsec45\u003cbr\u003eFits: SkyWatcher Quattro 250 Newtonian telescope secondary\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003eNotes:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\n\u003cspan\u003eOrder knobs with a \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.bobsknobs.com\/Newt\/page37\/styled\/XTphi.html\" title=\"Mesuring Secondary Screw Length\"\u003escrew length\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e (40 or 45mm) sufficient for the knobs to clear the secondary housing and still allow the dust cover to fit without contacting the knobs. The 40mm screw length is the most common.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003e______________________________________\u003cbr\u003e\u003cbr\u003eC. Knobs for SkyWatcher Quattro 300 Newtonian Secondary\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"image-right\"\u003e\u003cimg class=\"imageStyle\" alt=\"SWQ300\" src=\"https:\/\/www.bobsknobs.com\/Newt\/styled-6\/files\/swq300-2.jpg\" width=\"173\" height=\"173\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003ePart: CNsec35 or CNsec40\u003cbr\u003eFits: SkyWatcher Quattro 300 Newtonian telescope secondary\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003cbr\u003e\u003cbr\u003eNotes:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003col class=\"arabic-numbers\"\u003e\n\u003cli\u003e\n\u003cspan\u003eOrder knobs with a \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.bobsknobs.com\/Newt\/page37\/styled\/XTphi.html\" title=\"Mesuring Secondary Screw Length\"\u003escrew length\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e (35 or 40mm) sufficient for the knobs to clear the secondary housing and still allow the dust cover to fit without contacting the knobs. The 35mm screw length is the most common\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePlease check the \u003ca href=\"https:\/\/www.bobsknobs.com\/Newt\/page37\/styled\/XTphi.html\" title=\"bob's knobs screw lenght size\" rel=\"noopener\" target=\"_blank\"\u003eneeded Lenght Size Here\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA.  Knobs for SkyWatcher Quattro 150 and 200 Newtonian Secondary\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePart: CNsec30FT\u003cbr\u003e\u003c\/strong\u003eFits: SkyWatcher Quattro 150 and 200 Newtonian telescope secondary\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eB. Knobs for SkyWatcher Quattro 250 Newtonian Secondary\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart: CNsec40 or CNsec45\u003cbr\u003e\u003c\/strong\u003eFits: SkyWatcher Quattro 250 Newtonian telescope secondary\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eC. \u003c\/strong\u003e\u003cstrong\u003eKnobs for SkyWatcher Quattro 300 Newtonian Secondary\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart: CNsec35 or CNsec40\u003cbr\u003e\u003c\/strong\u003eFits: SkyWatcher Quattro 300 Newtonian telescope secondary\u003cbr\u003e\u003cbr\u003eKnobs: Black plastic, 13 mm (1\/2”) diameter\u003cbr\u003eThreads: Stainless steel\u003c\/p\u003e\n\u003ch3\u003eIn the box\u003c\/h3\u003e\n\u003cp\u003eSelected knobs (3)\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Instructions_English_a_Newt.pdf?v=1772297326\" target=\"_blank\" title=\"English manual bob's knobs English\" rel=\"noopener\"\u003eEnglish Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Instructions_French_a_Newt.pdf?v=1772297377\" target=\"_blank\" title=\"Bob's knobs french manual\" rel=\"noopener\"\u003eFrench Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"Quattro 150 or 200 \/ 30 mm","offer_id":48480512999653,"sku":"BOB-CNsec30FT","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"Quattro 250 \/ 40 mm","offer_id":48480516669669,"sku":"BOB-CNsec40","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"Quattro 250 \/ 45 mm","offer_id":48480516767973,"sku":"BOB-CNsec45","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"Quattro 300 \/ 35 mm","offer_id":48480516604133,"sku":"BOB-CNsec35","price":32.0,"currency_code":"CAD","in_stock":true},{"title":"Quattro 300 \/ 40 mm","offer_id":48480516702437,"sku":"BOB-CNsec40","price":32.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/SWQ150.jpg?v=1777043894"},{"product_id":"bobs-springs-for-skywatcher-dobsonian-newtonian-primary-cnspr","title":"Bob's Knobs Springs for SkyWatcher Dobsonian Newtonian Primary (CNspr)","description":"\u003ch2\u003eBob's Knobs Springs for SkyWatcher Dobsonian Newtonian Primary\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e SkyWatcher (5”, 6”, 8”, 10”, 12”) Newtonian telescopes\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font: 12px Arial, Verdana, Helvetica, sans-serif;\"\u003ePrimary mirror springs as supplied by the factory can sag from the weight of the mirror cell. Our stainless steel replacement springs are stronger and provide adequate support to maintain primary mirror collimation. We recommend that the mirror locking screws remain in place for additional control.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup span=\"2\" width=\"85\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003eFits:\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eSkyWatcher (5”, 6”, 8”, 10”, 12”) Newtonian telescopes.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003eMaterial\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSprings x3\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Instructions_English_a_Newt.pdf?v=1772297326\" title=\"English manual bob's knobs English\" rel=\"noopener\" target=\"_blank\"\u003eEnglish Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Instructions_French_a_Newt.pdf?v=1772297377\" title=\"Bob's knobs french manual\" rel=\"noopener\" target=\"_blank\"\u003eFrench Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Bob's Knobs","offers":[{"title":"Default Title","offer_id":48772909334757,"sku":"BOB-CNspr","price":28.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/mlbspr.jpg?v=1777043917"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/collections\/bob-s-knobs-astronomy-plus_f89db5d4-c258-4fb7-9555-a5de67ba8695.jpg?v=1715807858","url":"https:\/\/istronomyplus.com\/collections\/bob-s-knobs.oembed","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}