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Bob's Knobs for Celestron 8" EdgeHD Telescopes


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    • Large Collimation Knobs for your 8-Inch EdgeHD telescope
    • Set of 3 Knobs
    • Easy to find
    • Easy to use


Product Details

  • Now there is no more tools needed to make collimation adjustments to your telescope! It's easy . . . just grab a Bob's Knob and turn. You can even collimate while looking through the eyepiece on most telescopes. What's more, you'll never drop that pesky little Allen wrench or screwdriver in the grass again. Installation is a snap with included instructions, and you can undo the modification at any time.

    Fits: These knobs will fit only the Celestron 8 SCT with Fastar secondary and EdgeHD optics. These telescopes are marked EDGEHD OPTICS on the corrector ring. Do not use these knobs on the non-EdgeHD Fastar secondary; the screws on these knobs are too long. It is important that you choose the correct style Bob's Knobs for your telescope. Please note the number and type of screws on your secondary housing before ordering. The factory dust cover will fit normally with Bob's Knobs installed.

  • specifications

    Collimation ToolCollimation Knobs
    WarrantyLifetime Warranty
  • included items

      • Large Collimation Knobs for your 8-Inch EdgeHD telescope
      • Set of 3 Knobs
      • Easy to find
      • Easy to use


Product Reviews

Customer Reviews
4.7 Based on 3 Reviews
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  • pointy
  • Phillips
  • corrector plate
  • peesy
  • screwdriver
  • Edge HD
  • collimation
  • idea
  • learning curve
  • screws
Donald S.
United States United States

Parts is Parts

Great, had no issues with installing them. Easy to use, but a high learning curve for Collimation. DHS

OPT Telescopes Bob's Knobs for Celestron 8 EdgeHD Telescopes Review
Dale H.
United States United States

I wish Celestron would have thought of this

These screws make collimating my Edge HD 8 easy peesy. They are easy to install and easy to use. I really like the idea that I don't have a pointy, Phillips screwdriver any where near my corrector plate!

Bradley B.
United States


I ordered the wrong ones of course, but they sent me a return # and I ordered knew ones. They promptly refunded me for the wrong ones. They are still a bit harder to get a hold of but much easier than a screwdriver.