So after doing several shots and not really understanding the math I’ve had very good luck keeping stars round with my 102 f7 with 2.9 pixel cameras using sharpcap recommended values… example is when I imaged the Eagle nebula the other night I was using 11.5 second exposures and was able to go three hours….. in comparison if I went 15.1 seconds on my 180mak I could see trailing almost immediately. So anyway just taking notes of when I see stars out of round, how close to zenith or horizon I am and I think I can become comfortable knowing whether the sharpcap recommendations will work. When I first started I think I was attributing any issues with just tracking errors which can occur if the Az pro is not leveled properly but am starting to understand the effect of field rotation. Sharpcap does well doing the actual turning of the image overtime but that is an independent thing from the actual effect you get from actual sub exposure time. Please chime in if you have thoughts on this…. Right now I don’t know exactly how long the subs can go with the f7 or which parts of the sky are most forgiving but it’s obvious if I can get my subs right then sharpcap will do the rest for as long as I want to go
Edited by GSBass, 19 July 2021 - 11:47 AM.