Bob's Knobs for Orion (US) Astrograph and Mass-Produced Newtonian Telescopes: Simplifying Secondary Mirror Adjustments Unlock Precision Control: Elevate your stargazing experience with Bob's Knobs, compatible with Celestron, GSO, Hardin Optical, Meade, Orion, Synta, Zhumell, and more. Achieve accurate secondary mirror adjustments effortlessly. Part Details - Part: CNsec30 or CNsec35: Versatile Compatibility: These black plastic knobs are tailored for telescopes with a set screw secondary configuration, including Celestron C8-N/NGT, C10-N/NGT, Orion Astrograph, Astroview, SkyQuest XX and XT, Skyview, SkyWatcher, StarBlast, GSO, and others. 13 mm Diameter: Featuring a 13 mm (1/2”) diameter, these knobs provide a comfortable grip for precise control over your telescope's secondary mirror adjustments. Stainless Steel Threads: Crafted with stainless steel threads, these knobs ensure durability and longevity, making them an ideal choice for your telescope. Screw Length Options: Choose between 30 mm or 35 mm screw lengths to accommodate your telescope's unique secondary housing. Most configurations utilize knobs with 30 mm screws. Secondary Mirror Characteristics: Recognize telescopes with a 4-vane spider, a deeply recessed center screw, and factory headless set (grub) collimation screws. The secondary plate holding the screws is approximately 20 mm (3/4”) thick, a common Newtonian secondary configuration. Complete Set: The listed price includes a full set of knobs, offering you a comprehensive solution for enhancing the precision of your telescope's secondary adjustments. Note: Refer to the provided photographs and descriptions to determine the compatibility of these knobs with your telescope's secondary mirror configuration. Upgrade your stargazing setup with Bob's Knobs for unparalleled control.
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