Bob's Knobs Celestron C9.25 Fastar and EdgeHD Collimation Knobs

Bob's Knobs Celestron C9.25 Fastar and EdgeHD Collimation Knobs

  (2 Reviews)
✓ 2 year warranty


2x in stock shipped 1-2 working days

About this product

Model:  bk_c925_fst
Part Number:  C9.25fst

Bob's Knobs are the BEST option for tool-free collimation.

Simple to fit and easy to use.

Collimate your telescope without an Allen key or screwdriver!

Instructions are supplied but can also be found online as well as useful FAQ.

Images are representative and may not show the exact knob size / threads.

IMPORTANT: Please ensure the Bob's knobs threads and factory screw threads match before installation.

Knobs for C9.25 f/10 Secondary with Metric Collimation Screw Threads and “Trifid” Fastar Housing

Part: C9.25fst
Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing

Knobs: Black plastic, 15 mm (5/8”) diameter
Threads: Stainless steel

  1. These knobs fit the Celestron 9.25” f/10 SCT with a Fastar secondary which has black Phillips factory collimation screws that are recessed into the secondary housing. These versions may or may not have EdgeHD optics.
  2. 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.
  3. Knobs include a set of long spacers so they sit slightly above the rotary cover opening.
  4. The factory dust cover will fit normally with Bob’s Knobs installed.
  5. 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.

Customer reviews

Average Rating (2 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Bobs Knobs
19 May 2023  | 

Arrived promptly, not yet fitted as I am awaiting a new electronic collimator, look really well made and should, in combination with the collimator, make life and acheiving good images (when the clouds clear) easier!

Rating (max 5):  
Easy to fit. Easy to adjust
18 August 2021  | 

Bought these for my Celestron C9.25 SCT. Easy to fit as long as you follow the clear instructions provided.
It felt easier and a lot safer collimating my scope using these knobs


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