Gift-Cards
Bob’s Knobs
Bob’s Knobs 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.
Ideal for both beginners and experienced users, Bob’s Knobs improve convenience, accuracy, and confidence when maintaining optimal telescope performance.
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$39.00
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Bob's Knobs for Celestron 8" SCT
Bob's KnobsBob's Knobs for Celestron 8" SCT A. Knobs for C8 f/10 Pre-1980 Orange-Tube Secondary Part: C8orgFits: Pre-1980 Celestron 8” (20 cm) f/10 SCT with ...
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$32.00
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Bob's Knobs for Common Newtonian Secondary
Bob's KnobsBob's Knobs for Common Newtonian Secondary Fits: Celestron C8-N/NGT, C10-N/NGT, Celestron StarSense DX, Explorer Newtonian telescopes, Orion Astrog...
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Bob's Knobs for Celestron 11" SCT
Bob's KnobsBob's Knobs for Celestron 11" SCT We offer knobs for all versions of the Celestron 11” f/10 Schmidt-Cassegrain secondary with either standard or me...
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$32.00
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Bob's Knobs for Celestron 5" SCT
Bob's KnobsBob's Knobs for Celestron 5" SCT A. Knobs for C5 f/10 Secondary with Standard Collimation Screw ThreadsPart Part: C5stdFits: Celestron 5” (13 cm) ...
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Bob's Knobs for Celestron 9.25” SCT
Bob's KnobsBob's Knobs for Celestron 9.25” SCT A. Knobs for C9.25 f/10 Secondary with Standard Collimation Screw Threads Part: C9.25stdFits: Celestron 9.25”...
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Bob's Knobs for Celestron 6” SCT
Bob's KnobsBob's Knobs for Celestron 6” SCT The knobs below will fit almost all versions of the Celestron 6” Schmidt-Cassegrain secondary. Price is for a com...
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Bob's Knobs for SkyWatcher & Celestron Newtonian Primary (SWpri)
Bob's KnobsBob's Knobs for SkyWatcher & Celestron Newtonian Primary Fits: SkyWatcher Newtonian telescopes with factory collimation screws.Primary collima...
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Bob's Knobs Springs for SkyWatcher Dobsonian Newtonian Primary (CNspr)
Bob's KnobsBob's Knobs Springs for SkyWatcher Dobsonian Newtonian Primary Fits: SkyWatcher (5”, 6”, 8”, 10”, 12”) Newtonian telescopes. Primary mirror springs...
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Bob's Knobs for Sky Watcher Quattro Newtonian Secondary Mirror
Bob's KnobsBob's Knobs for Sky Watcher Quattro Newtonian We offer knobs for the SkyWatcher Quattro Newtonian secondary. The Quattro primary is already equippe...
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Bob’s Knobs for Celestron 14″ SCT (C14metphi)
Bob's KnobsBob’s Knobs for Celestron 14″ SCT Fits: Celestron 14” (36 cm) f/11 SCT versions with factory headless set-style (Allen or slotted) collimation scre...
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Bob's knobs for MEADE 12” (30 cm) SCT
Bob's KnobsBob's knobs for MEADE 12” (30 cm) SCT We offer knobs for all versions of the Meade 12” f/10 and f/8 Schmidt-Cassegrain secondary, including those w...
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Bob's Knob for Common Newtonian Primary (Starfield & GSO 6" to 16")
Bob's KnobsBob's Knob for Common Newtonian Primary Common Newtonian-style telescope primary configurations: These knobs will fit most Newtonian reflectors mad...
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$49.00
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Bob's Knob telescope collimation thumbscrews for Meade Lightbridge 8 inch primary
Astronomy Plus
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$56.00
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Bob's Knobs for MEADE 16” (41 cm) SCT
Bob's KnobsBob's Knobs for MEADE 16” (41 cm) SCT We offer knobs for all versions of the Meade 16” f/10 Schmidt-Cassegrain secondary, including those with thre...
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$56.00
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Bob's Knobs for MEADE 14” (36 cm) SCT
Bob's KnobsBob's Knobs for MEADE 14” (36 cm) SCT We offer knobs for the Meade 14” f/10 (Item A) and f/8 (Item B) Schmidt-Cassegrain secondary with exposed col...
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Bob's Knobs for MEADE 10” (25 cm) SCT
Bob's KnobsBob's Knobs for MEADE 10” (25 cm) SCT We offer knobs for all versions of the Meade 10” f/10 and f/6.3 Schmidt-Cassegrain secondary, including those...
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$32.00
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$49.00
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$28.00
Bob's Knobs for MEADE 8” (20 cm) SCT
Bob's KnobsBob's Knobs for MEADE 8” (20 cm) SCT We offer knobs for all versions of the Meade 8” f/10 and f/6.3 Schmidt-Cassegrain secondary, including those w...
View full details
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$28.00
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$49.00
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Bob's Knobs for Meade 6" SCT
Bob's KnobsBob's Knobs for Meade 6" SCT The knobs below will fit all versions of the Meade 6” Schmidt-Cassegrain secondary. Price is for a complete set of kno...
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$42.00
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![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary (AT8RC) - Astronomy Plus](http://astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-8-f8-ritchey-cretien-secondary-at8rc-astronomy-plus_152x152.webp?v=1690490819)
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Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary (AT8RC)
Bob's KnobsBob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary Fits: Astro-Tech, GSO, iOptron, MallinCam, O...
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![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC) - Astronomy Plus](http://astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-6-f9-ritchey-cretien-secondary-at6rc-astronomy-plus_152x152.webp?v=1690490819)
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Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC)
Bob's KnobsBob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary Fits: Astro-Tech, GSO, iOptron, MallinCam, O...
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