Like many users, I use a newton f4 and OAG for astrophotos. My focuser has a threaded coupling m54 female on which I screwed mount an eyepiece holder with expansion ring (I attach an image). It is not always easy to find the right backfocus and it would be great if the new ZWO derotator had a telescope-side m54 mount with a generously length thread for a safe mounting directly on the focuser, upstream of the optical train.
At this point the normal configuration could be used, and the whole optical train, including the coma corrector, would rotate in solidarity. A small detail would make a huge difference. Simple as 1 2 3!
