Quote:
Originally Posted by Peter Ward
I focused on a star at the top edge of the frame, then refocused on the lower edge. The difference was 144 counts on the Atlas focuser or 0.012 mm....
(each atlas step is 0.08 micron)
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Ahh yes, thats an effective and simple method. in you're situation this works a treat because you dont have to collimate you're scope. With scopes that have adjustable collimation, this is not so easy because if the collimation is out a little, the focus distances will be a little different on oposite sides of the chip - regardless of tilt. this has been my experience.