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  • Bob's Knobs Bob's Knobs Astro Tech Collimation Knobs - Secondary Mirror - AT10RC
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  • Bob's Knobs Bob's Knobs Astro Tech AT12RC Collimation Knobs - Secondary Mirror - AT12RC
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  • Bob's Knobs Bob's Knobs Astro Tech AT6RC & AT8RC Collimation Knobs - Secondary Mirror - AT8RC
    $25.95
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  • Bob's Knobs Bob's Knobs Celestron 11" SCT f/10 Metric Collimation Knobs - Black Oxide - C11METBO
    $20.95
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  • Bob's Knobs Bob's Knobs Celestron 11" SCT f/10 Collimation Knobs - Standard Secondary - C11STD
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  • Bob's Knobs Bob's Knobs Celestron 11" SCT f/10 Fastar Standard Collimation Knobs - C11STDFST
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  • Bob's Knobs Bob's Knobs Celestron 14" SCT f/11 Collimation Knobs - Standard Phillips - C14STDPHI
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  • Bob's Knobs Bob's Knobs Celestron 14" SCT f/11 Collimation Knobs Set Screw - C14SET
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  • Bob's Knobs Bob's Knobs Celestron 5" SCT f/10 Metric Secondary Collimation Knobs - Black Oxide - C5METBO
    $20.95
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  • Bob's Knobs Bob's Knobs Celestron 5" SCT Collimation Knobs Standard Secondary - C5STD
    $18.95
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  • Bob's Knobs Bob's Knobs Celestron 6" SCT Collimation Knobs Secondary - Black Oxide - C6BO
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  • Bob's Knobs Bob's Knobs Celestron 8" EdgeHD Collimation Knobs - Black Oxide - C8EDGBO
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  • Bob's Knobs Bob's Knobs Celestron 8" SCT Hyperstar Secondary Collimation Knobs - Black Oxide - C8HYPBO
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  • Bob's Knobs Bob's Knobs Celestron 8" SCT Collimation Knobs - Metric - Black Oxide - C8METBO
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  • Bob's Knobs Bob's Knobs Celestron 8" SCT Collimation Knobs Secondary - C8STD
    $20.00
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  • Bob's Knobs Bob's Knobs Celestron 9.25" SCT Fastar Collimation Knobs Secondary - C925FST
    $20.95
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  • Bob's Knobs Bob's Knobs Celestron 9.25" SCT Secondary Collimation Knobs Metric - Black Oxide - C925METBO
    $20.95
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  • Bob's Knobs Bob's Knobs Celestron 9.25" SCT Collimation Knobs Standard Secondary - C925STD
    $20.95
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  • Bob's Knobs Bob's Knobs SkyWatcher 5" - 10" & C6, C8, and C10; Newtonian Secondary Collimation Knobs - CNSEC30
    $20.95
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  • Bob's Knobs Bob's Knobs Secondary Collimation Knobs for Orion OD Newtonians & C6, C8, and C10- CNSEC35
    $20.95
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  • Bob's Knobs Bob's Knobs Meade 10" SCT Collimation Knobs for 3-Screw Secondary - M10-3
    $16.95
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  • Bob's Knobs Bob's Knobs Meade 10" SCT Collimation Knobs for 6-Screw Secondary - M10-6
    $16.95
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  • Bob's Knobs Bob's Knobs Meade 10" SCT f/6.3 Collimation Knobs w/ Dust Cover Spacers - M10WF
    $25.95
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  • Bob's Knobs Bob's Knobs Meade 12" SCT Collimation Knobs For 3 or 4 Screw Secondary - M12-3
    $16.95
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  • Bob's Knobs Bob's Knobs Meade 14" SCT Collimation Knobs For 6-Screw Secondary - M14-6E
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  • Bob's Knobs Bob's Knobs Meade 16" SCT Collimation Knobs For 3-Screw Secondary - M16-3
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  • Bob's Knobs Bob's Knobs Meade 16" SCT Collimation Knobs For 6-Screw Secondary - M16-6
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  • Bob's Knobs Bob's Knobs Meade 6" SCT f/10 Collimation Knobs For 6-Screw Secondary - M6-6
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  • Bob's Knobs Bob's Knobs 8" Meade SCT 3-Screw Secondary - M8-3
    $16.00
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  • Bob's Knobs Bob's Knobs Meade 8" SCT Collimation Knobs For 4-Screw Secondary - M8-4
    $16.95
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  • Bob's Knobs Bob's Knobs for Meade 8" SCT with 6-Screw Thread - M8-6
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  • Bob's Knobs Bob's Knobs Meade 8" SCT Widefield f/6.3 Collimation Knobs W/ Dust Cover Spacers - M8WF
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  • Bob's Knobs Bob's Knobs Meade 10" Lightbridge Collimation Knobs For Primary Screws - MLB10pri
    $27.95
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  • Bob's Knobs Bob's Knobs Meade 12" Lightbridge Low Profile AZ Lock 5/16" - MLB12AZ1
    $9.95
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  • Bob's Knobs Bob's Knobs Meade 12" Lightbridge Low Profile AZ Lock 3/8" - MLB12AZ2
    $9.95
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  • Bob's Knobs Bob's Knobs Springs for Meade 8", 10" & 12" Lightbridge - CNSPR
    $16.95
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  • Bob's Knobs Bob's Knobs Meade Starfinder 10" Collimation Knobs - Primary Screws - MSF10PRI
    $27.95
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  • Bob's Knobs Bob's Knobs Meade SNT 6" Collimation Knobs - Secondary Screws - MSN6SEC
    $20.95
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  • Bob's Knobs Bob's Knobs Meade SNT 8" Collimation Knobs Secondary Screws - MSN8SEC
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  • Bob's Knobs Bob's Knobs Meade SNT 10" Collimation Knobs Secondary Screws - MSN10SEC
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Bob’s Knobs understands that telescope collimation can be a struggle for observers new to astronomy, but it is crucial to enjoying your telescope to the fullest. Optics out of alignment, or collimation, yield images with noticeable imperfections. For example, stars will not come to a pinpoint focus and planets will look slightly hazy. The best way to prevent this from happening is to collimate your scope.


To achieve collimation, telescopes often include screws which require a screwdriver to modify the position of the mirrors. Unless you are careful, that screwdriver could scratch your optical tube assembly, or even the optics themselves. Moreover, your OTA’s mirrors are highly sensitive, and it can often be difficult to get such a precise micro-adjustment with a screwdriver.


Collimation is often the most frustrating aspect for beginners, but it doesn’t have to be. Bob’s Knobs makes it easy to collimate your Newtonian or Catadioptric telescope with their collimation thumbscrew sets. There’s no screwdriver, no Allen wrench. Simply install the knobs and you are ready to collimate with the twist of a wrist. Bob’s Knobs work with many Catadioptric and Newtonian telescopes, from makers like Celestron, Meade, Orion, and more! Not sure where to start? The experts at High Point Scientific are ready to help you get the most out of your scope!

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