The weather is bad, so I had Dan modify the flat field box and I am running darks and flats. I am running them in groups of 20. I plan to take 20 flats (about half full scale) 20 darks 20 flats with the flat box rotated then a few bias frames. OK, I know you would like me to mix dark and flat frames. But this is what I can to at the moment. Suggestions would be welcome. Tom Droege