Bob's Knobs Celestron SCT 8” EdgeHD (stainless steel)

Bob's Knobs for Celestron SCT 8” EdgeHD: Precision Collimation at Your Fingertips Specialized for Celestron SCT 8" EdgeHD: Exclusively designed for the Celestron 8” (20 cm) f/10 SCT with Fastar secondary and EdgeHD optics. Part Information - Part: C8edgBO and C8edgSS: Telescope Compatibility: Perfectly fits Celestron 8" f/10 SCTs marked “EDGEHD OPTICS” on the corrector ring. Knob Variants: Available in black oxide steel (black) or stainless steel (silver), each 12 mm (1/2”) in diameter for ease of use. Thread Material: Choose between black oxide or stainless steel threads for a secure and lasting fit. Important Usage Notes: Specific Model Fit: These knobs are only for the EdgeHD Fastar secondary version. Not for use on non-EdgeHD Fastar secondaries due to screw length differences. Thread Length Matching: Ensure the thread length on our knobs matches that of the factory collimation screws. Environmental Suitability: Black Oxide Steel Use: Ideal for dry climates; period