Quote:
Originally Posted by naskies
I'd probably be more concerned about why the focus was so far out? 
I find manually focusing by watching FWHM numbers to be rather tricky, since it fluctuates so much even in good seeing. I like using a Bahtinov mask in combination with the Bahtinov Grabber program. It provides real-time feedback for how far out-of-focus you are, and whether you're in the critical focus zone for your optical configuration. |
Good point. I also now use Bahtinov Grabber to quantify exactly how far out-of-focus I am, and if I am within the CFZ. Much easier than just eye-balling it, and far more repeatable.