Brands - JMI



Celestron C9.25 f/10 with Standard Threads


SKU: C9.25std
Manufacturer: Bob's Knobs
Availability: IN STOCK


These knobs fit Celestron C9.25 optical tubes equipped with silver Phillips collimation screws. 

Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with standard collimation screw threads (not for CPC 925 or EdgeHD).

Knobs: Black plastic, 16 mm (5/8”) diameter

Threads: Black anodized aluminum alloy


  1. 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. Make sure the knob threads match the factory screw threads before installing the knobs.
  2. The factory dust cover will fit normally with Bob’s Knobs installed.
  3. Knobs include a set of long spacers so they clear the secondary housing lip.
  4. Celestron 9.25” SCTs manufactured prior to 2006 have standard collimation screw threads.

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