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; periodic oiling recommended for rust prevention.
- Stainless Steel Advantage: Offers enhanced corrosion resistance, suitable for coastal, humid areas, or places with frequent condensation.
Dust Cover Compatibility:
- Normal Fit with Knobs Installed: The factory dust cover will continue to fit as usual with Bob's Knobs installed.
Enhanced Telescope Maintenance: Perfect for Celestron SCT 8” EdgeHD telescope owners seeking a simple, tool-free solution for accurate collimation adjustments.