{"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","url":"https:\/\/istronomyplus.com\/products\/bobs-knobs-for-common-newtonian-secondary","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}