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Dave
Excellent M83
Detail and colour spot on
You’ve got that big scope dialed in well
After exhaustive testing with my 2600MC I found Bias frames calibrated with my Flats works best
I’ve tried Dark flats , Darks you name it and Bias works best with and without filters and under different sky conditions
I use an ADU target of 21,000 in APT to get my histogram up to 1/2 way ( not overexposed ) ADU read out range is around 8,500 to 31,500
Without filters Flats are usually 0.2 to 0.5 sec
With an L Extreme filter Flats are usually 7 sec to 13 sec
Bias frames are taken with an exposure of 0.000032 , the lowest setting for this camera
I take 40 to 50 Flats and 50 to 70
Bias
I don’t use Master Flats or Master Bias
Well done !!
Martin
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