Adjusting screws for the viewfinder of a 5 inch SCT f/6 | Bob’s Knobs

With a compact 5-inch tube, the collimation screws on the secondary holder are small and difficult to access, especially with cold fingers. These adjustment screws for a 5-inch SCT f/6 from Bob’s Knobs replace them with knobs that you twist without tools. This keeps adjusting a simple task of a few minutes.

The set is only intended for 5 inch Schmidt-Cassegrains with f/6. So, make sure that the diameter and aperture ratio of your telescope match. You can find these types of telescopes at catadioptric telescopes.

Replace the screws one by one so that the mirror stays in place, and then adjust the collimation to a bright star. Against a fogged corrector plate, a rainbow band for 5 inch telescopes.

If you have a 5 inch SCT with a f/10 lens and metric thread, please use the set for the f/10 version.