I have started to use my Celestron 9.25" for astrophotography, both deep sky and planets. Would really like to set up a autofocusing system to improve focus, and to better deal with changes in temperatures too. Moonlight gets rave reviews, but is the most expensive, on the other extreme some people use the pegasus focus cube, primalucelab sesto senso, or similar units. So far I am leaning towards the nstep focuser, motor and controller or the moonlight. The moonlight replaces the focuser, allows the reducer to fit inside, so may create issues for back focus (I would have reducer, OAG, DSLR and maybe someday a filter wheel & CCD) and is quite heavy, but is a much more robust focusing system; the nstep the focus cube and others use the existing focuser, so less robust but avoids issues of back focus and is fairly light weight. Still wondering if the moonlight is worth the extra price and if anybody has run into back focus issues, or if using the existing focuser works well enough for photography, or if there are other issues I should be thinking about.
Edited by palaback, 16 September 2019 - 12:48 PM.