I see you explicitly mentioned that number for the first model but didn't for the second model.
I called it a "small" model on both occasions - therefore same rules - its in the name (I'm a programmer : ) ). You are just iteratively repeating the process until "convergence". When your PA error is <1 arc min your are basically converged enough - and unless you have a floppy mirror scope that will happen in two passes if it hasn't happened on the first
For the final model, how many points do you recommend for 600s unguided with a rigid fsq-85? I was thinking between 50 and 60.
You can't recommend - its a function of many factors to do with you specific mount and scope as what you can get away with. Easiest answer is always as many as you can do - mine are always 80+ - and that is for a Tak TOA130. Experiment - try small and large and see what you get. With my TV85 I can use a 25 point model for 10 minutes unguided but that has a wider FOV. Note your points should be evenly spread of course.
Edited by Tonk, 18 April 2021 - 08:03 PM.