FOC Instrument Science Report #095 October 29, 1996 "FOC f/48 Geometric Correction" by M. Voit and W. Hack Abstract excerpted from the report: This report summarizes our program to correct the geometric distortion of the f/48 imaging camera. We used several offset observations of 47 Tuc to correct the 256zx1024 format, and this correction model was then used to determine the distortion of the 512zx1024 format. The description of the geometric correction procedure presented here can serve as a primer for future determinations of FOC geometric distortion. Because the offsets used to correct the f/48 distortion were highly symmetric, spurious systematic 2-D modes crept into the correction algorithm when we use too fine a grid for the spline model correction. With the newly corrected imaging format, we should be able to place targets directly into the f/48 slit in a single slew following the initial acquisition.
