We offer knobs for all versions of the Celestron 9.25” f/10 SCT secondary with either standard or metric collimation screws, including Fastar, non-Fastar, and EdgeHD versions. Select knobs for your telescope from the list below.
Special Note: The Celestron 9.25” SCT uses either standard 6-32 or metric M3 collimation screws. Allen and set-style factory collimation screws have standard threads. For Phillips collimation screws, most silver screws are standard and most black screws are metric. See our hints for more information.