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 Standard Collimation Screw ThreadsPart:
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”) diameterThreads:
Black Anodised Aluminium alloy
- Silver factory collimation screws have standard threads. Our hints will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.
- The factory dust cover will fit normally with Bob’s Knobs installed.
- Knobs include a set of long spacers so they clear the secondary housing lip.
- Celestron 9.25” SCTs manufactured prior to 2006 have standard collimation screw threads.