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Celestron 11" (28 cm) f/10 SCT with Flat Seconday Housing (Metric Thread)

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 11 inch (28 cm) f/10 SCT versions with flat secondary housing and metric M3 screw threads (CPC 1100)
  • Knobs: Black-oxide steel, 12 mm (1/2 inch) diameter.
  • Threads: Black-oxide steel.
  • Note 1: Make sure the knob threads match the factory screw threads before installing the knobs.
  • Note 2: The factory dust cover will fit normally with Bob's Knobs installed.
  • Note 3: The CPC 1100 SCT requires knobs with metric threads. The CPC 1100 secondary can be identified by a factory-installed plastic cap over the 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.
  • Note 4: Celestron 11 inch SCTs manufactured prior to 2006 had standard 6-32 collimation screws. Do not use metric knobs on those telescopes.

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

    This product was added to our catalog on Wednesday 12 July, 2006.
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