Bob's Knobs for C8 f/10 Secondary with EdgeHD Optics
Knobs for C8 f/10 Secondary with EdgeHD Optics
Part: C8edgBO (black oxide steel); C8edgSS (stainless steel)
Fits: Celestron 8” (20 cm) f/10 SCT with Fastar secondary and EdgeHD optics.
Knobs: Black oxide steel (black) or stainless steel (silver), 12 mm (1/2”) diameter
Threads: Black oxide or stainless steel
- These knobs will fit only the Celestron 8” SCT with Fastar secondary and EdgeHD optics. These telescopes are marked “EDGEHD OPTICS” on the corrector ring. Do not use these knobs on the non-EdgeHD Fastar secondary; the screws on these knobs are too long. Be sure to check that the thread length on our knobs matches the thread length on the factory collimation screws.
- 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.