December 23, 2010
Click on image to left to see curvature and 3d plot of RCOS
16/SBIG STL6303E at 3 different rotation angles. Altitude
mid-60degrees, one minute unguided auto-dark exposures.
Seeing was poor, no focus adjustments between rotations.
Collimation done during daylight only by careful centering
of secondary assembly using 3/32 allen wrench as guide for
spider/secondary ring gap, and Takahashi collimation scope
to center secondary tilt/tip and primary tilt/tip.