Quote:
Originally Posted by Joshua Bunn
Looking good Peter  how did the star field look?
Gee, the tolerances must be small with fast focal ratios. what did you do to find the residual 12 micron tilt? |
Used CCD inspector to get the direction of the tilt, which thankfully was pretty much along the Y axis.
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)