|
for 8~10 minute subs... fairly critical.. you dont need to be PERFECT! but the further out you are, the more likely it will be that your images will have field rotation...
I aim to have the polar alignment as perfect as is possible on any given night of imaging, this way the autoguider has to do less work... only correcting for my mounts inadequacies, not also correcting for poor polar alignment... This generally results in much finer images... I recommend mastering drift alignment, its not hard, it doesnt take long, and your images will benefit greatly...
Alex.
|