Bob's Knobs Celestron C9.25 f/10 Secondary (non-Fastar) with Metric Collimation Screw Threads
Collimate your Schmidt Cassegrain Telescope or Newtonian Reflector Telescope without tools when you use Bob's Knobs!
It's easy... just grab a Bob's Knob Collimation Thumbscrew 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 into the grass again. Installation is a snap with the included instructions, and you can undo the modification at any time.
Note: Black Phillips factory collimation screws usually have metric threads, but some black Phillips screws have standard threads. Make sure the knob threads match the factory screw threads before installing the knobs.
These knobs sit inside the tall lip around the perimeter of the secondary, so they may be hard to grasp with two fingers. Adjustments can be made using a thumb or finger against the inside edge of the knob.
If your telescope has the "Trifid" Fastar rotary cover, these knobs will not fit.
The factory dust cover will fit normally with Bob's Knobs installed.
If your telescope has a factory-installed plastic cap over the collimation screws, it 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 is a snap with the included instructions
- Modification can be undone at any time
- Knobs are crafted from black plastic, black oxide steel (black) and/or stainless steel (silver)
- No tools required to perform a collimation!
Bob's Knobs Celestron C9.25 f/10 Secondary (non-Fastar) with Metric Collimation Screw Threads Specifications:
Equipment Type: Collimation Knobs
Fits: Celestron 9.25" (23.5 cm) f/10 SCT versions with metric screw threads (CPC 925). Not for C9.25 with "Trifid" Faster or EdgeHD optics
Knobs: Black oxide steel (black), 12 mm (1/2") diameter
Threads: Black oxide