I've recently made the leap from DSLR to an ASI1600-MM, and it's going great! I've adapted my acquisition processes so that I'm now getting the best guiding, FWHM, and eccentricity values I've seen yet. I even had a chance to take it up to Cherry Springs for some dark sky action and acquired some truly excellent data. I'm curious about how to compare the data from each site though.
For reference, here are the relevant statistics for comparison. Both images are of the Witch's Broom, S2 filter, 10 minutes, Gain 200, Offset 50, (Minimum) Target ADU (16-bit) = 1300. Median ADU was measured from uncalibrated frames, while SNRWeight was measured (in PixInsight) on the same frames after calibration.
Backyard: SQM = 19.47, Median ADU = 1440, SNRWeight = 1.4359
Cherry Springs: SQM = 21.94, Median ADU = 1175 (I've read that 10 minute exposures are the maximum duration you should do with this camera, so I didn't increase the exposure even though this fell below 1300.), SNRWeight = 3.0615
So, the difference in sky brightness should be 2.512^(21.94-19.47) = 9.73, so an hour at the dark site should equal 9.73 hours in my backyard. Comparing the SNRWeights in PixInsight shows a much more modest ratio of 2:1. Am I looking at this the right way? If so, what is causing the discrepancy? If not, where am I going wrong?
As always, thank you for considering my question!