Bob's Knobs for Celestron C9.25 f/10 Secondary with Trifid Fastar Housing
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Special Note: The Celestron 9.25" SCT uses either standard 6-32 or metric M3 collimation screws. Allen and set-style factory collimation screws have standard threads. For Phillips collimation screws, most silver screws are standard and most black screws are metric. See our hints for more information.
Collimate your Catadioptric or Newtonian reflector style telescopes without tools!
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. These thumbscrews are also much easier to use with gloves on. And perhaps most importantly, 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.
Part: C9.25fst
Fits: Celestron 9.25" (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing ONLY
Knobs: Black plastic, 15 mm (5/8") diameter
Threads: Stainless steel or black oxide steel
Notes:
- These knobs fit only the Celestron 9.25” f/10 SCT with a Fastar secondary (second photo) which has black Phillips factory collimation screws that are recessed into the secondary housing. These knobs will fit C9.25 Fastar telescopes with or without EdgeHD optics.
- Collimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.
- Knobs include a set of long spacers so they sit slightly above the rotary cover opening.
- The factory dust cover will fit normally with Bob’s Knobs installed.
- The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
Other Information
- Country of Manufacture: United States
Collimate your Catadioptric or Newtonian reflector style telescopes without tools!
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. These thumbscrews are also much easier to use with gloves on. And perhaps most importantly, 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.
Part: C9.25fst
Fits: Celestron 9.25" (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing ONLY
Knobs: Black plastic, 15 mm (5/8") diameter
Threads: Stainless steel or black oxide steel
Notes:
- These knobs fit only the Celestron 9.25” f/10 SCT with a Fastar secondary (second photo) which has black Phillips factory collimation screws that are recessed into the secondary housing. These knobs will fit C9.25 Fastar telescopes with or without EdgeHD optics.
- Collimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.
- Knobs include a set of long spacers so they sit slightly above the rotary cover opening.
- The factory dust cover will fit normally with Bob’s Knobs installed.
- The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
Special Note: The Celestron 9.25" SCT uses either standard 6-32 or metric M3 collimation screws. Allen and set-style factory collimation screws have standard threads. For Phillips collimation screws, most silver screws are standard and most black screws are metric. See our hints for more information.
Collimate your Catadioptric or Newtonian reflector style telescopes without tools!
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. These thumbscrews are also much easier to use with gloves on. And perhaps most importantly, 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.
Part: C9.25fst
Fits: Celestron 9.25" (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing ONLY
Knobs: Black plastic, 15 mm (5/8") diameter
Threads: Stainless steel or black oxide steel
Notes:
- These knobs fit only the Celestron 9.25” f/10 SCT with a Fastar secondary (second photo) which has black Phillips factory collimation screws that are recessed into the secondary housing. These knobs will fit C9.25 Fastar telescopes with or without EdgeHD optics.
- Collimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.
- Knobs include a set of long spacers so they sit slightly above the rotary cover opening.
- The factory dust cover will fit normally with Bob’s Knobs installed.
- The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
Other Information
- Country of Manufacture: United States
Bob's Knobs for Celestron C9.25 f/10 Secondary with Trifid Fastar Housing