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Celestron 8" (20 cm) f/10 SCT with Metric Collimation Screws

SCT Collimation without Tools: BOB'S KNOBS

It's easy . . . just grab a Bob's Knob and turn. You can even do it while looking through the eyepiece on most scopes. And you'll never drop that pesky little Allen wrench or screwdriver on your corrector plate, or in the grass again. Installation is a snap with included instructions, and you can undo the modification at any time.

In particular, this model:

  • Fits: Celestron 8 inch (20 cm) f/10 SCT made in 2005 and later years with black Phillips factory collimation screws (some CPC 800 models). These screws have metric threads.
  • Knobs: Black plastic, 10 mm (3/8 inch) diameter.
  • Threads: Stainless steel.
  • Note 1: These knobs will fit only 2005 and later C8 models that have black Phillips factory collimation screws. All C8 models make prior to 2005 and all post-2005 models with silver factory collimation screws require C8 standard knobs. Check that our screw threads match the factory screw threads before installing.
  • Note 2: The factory dust cover will fit normally with Bob's Knobs installed.
  • Note 3: Some telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.

  • Installation instructions are available in English, Spanish, German, Italian and French.

    This product was added to our catalog on Sunday 30 April, 2006.
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