{"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","url":"https:\/\/istronomyplus.com\/products\/bobs-knobs-for-meade-8-20-cm-sct","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}