= Calibration / STD field =

* 2 defocus  3 exptime  7 filters 5 stars of tertiary stds from John and Gene  -> engineering issues

* to work out general observing cal  issues together with Gene & John & Chris

* isp - g,y on every GPC image, and either r or i, the one we are in. if in g,y, then i.   for zy, do  g,y?  or z,y?

** post MD cal images

* photodiode - maybe in concert with above - work out spacing, offsets, technique in bad conditions










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