Hello all,

So I’ve been struggling with getting my auto focus routine to consistently produce nice results for a couple of months already and no luck. I won’t mention equipment because I have been trying with different setups, including an ES 127 with Feather Touch, Edge 800 with Feather Touch and WO Star 71 with stock focuser. I have 2 steppers, the Microtouch Wireless and the Rigel Nstep.

So I’ve been reading posts about the subject and trying to identify possible errors I am making and I have 2 basic questions. First, how do I determine my fine and coarse focus? As of right now I just have some logical numbers like 10-100 but I am not sure if those are the correct numbers and how I would get to that number. Will those numbers influence anything in the auto focusing routine?

My next questions is regarding step sizes. What I’ve been doing is check my focus position, check the HFR number, go up 3-5 times, note focus position again, subtract small number from large number and divide by 9 (focus points). But today I was reading a post here that this process should be done differently by achieving focus with a Baht mask, going out 3-5 HFR then back to perfect focus then in another 3-5 HFR from perfect focus than subtracting the smaller number from the large and doing the math above, if this is correct I’ve been doing it wrong all this time, so which one is right?

Thank you!