About this product
Part Number: C8hypBO
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 C8 f/10 Secondary with Hyperstar and Metric Collimation Screw ThreadsPart:
C8hypBO (black oxide steel); C8hypSS (stainless steel)Fits:
Celestron 8” (20 cm) f/10 SCT with metric collimation screws and Hyperstar optionKnobs:
Black oxide steel (black) or stainless steel (silver), 12 mm (1/2”) diameterThreads:
Black oxide or stainless steelNotes:
- These knobs are taller than our other metric knobs to compensate for the countersunk factory screws in the Hyperstar secondary.
- Black oxide steel (shown in photo) is for dry environments. Lightly oil the knobs periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.
- The factory dust cover will fit normally with Bob's Knobs installed.
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