= Observe Photometric Standards on Imagers v01 =

Purpose:  We want to check on the zero points for the camera.  We need a sloan star with known magnitudes imaged through each filter near the center of the track.  Thus the conditions need to be nearly perfectly clear (including dust < 15k) although the seeing can be slightly poor.

Procedure:  

  1)  Select a Star from photometric catalog (probably fainter than 15) which is before the center of track

  2)  Setup on star in camera of interest, GC1, GC2 or ACQ

  3)  Image through each filter as the target passes the center of track.   Exposures should be longer than 4 seconds in all filters but not saturated (<40,000 ADU)

  4)  Record the star observed and tracker status.