I have always struggled to make ASTAP work at Long focal lengths, eg 4000mm+
ASTAP requires focal length, and focal length for something like Edge HD 8" changes with focus. So you can never be sure its 2000mm or 2100mm, and that can apparently break ASTAP.
Do there exist plate solvers which can do plate solving with a rough focal length?
The max I have been able to solve is full frame DSLR on a 2000mm, but when I go to a 1" sensor on the same scope, even with 2000mm put in it just failed, both primary and secondry ASTAP with N.I.N.A
I am wondering is there a way to do plate solving over such focal lengths. Any software etc., when there is no internet access?