Bob's Knobs Celestron 8" EdgeHD Stainless Steel Knobs
Bob's Knobs Celestron 8" EdgeHD Stainless Steel Knobs
These collimation knobs from Bob's Knobs fit Celestron 8" (20cem) f/10 SCT with Fastar secondary and EdgeHD optics. They are made out of silver stainless steel to help prevent corrosion in moisture-heavy areas. They measure 12mm (1/2") in diameter, allowing for the dust cover to fit normally while the knobs are installed.
Note, these knobs will only fit Celestron 8" SCT with Fastar secondary and EdgeHD optics; the screws are too long to fit with non-EdgeHD Fastar secondary. Be sure to check that the length of the knob matches the thread length on the factory collimation screws before installing.