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Alex,
Great capture of a dim Galaxy
Well done !!
After months of testing calibration, my 2600MC ( and I would assume the 2600MM too ) works best with flats and bias
I tried dark flats with flats but it didn’t correct the field or mitigate Vignetting
Flats and bias work perfectly
Maybe different for a refractor but for all my Newts , flats and bias just works
I also checked on Cloudy Nights and most folk use Flats and Bias
I use 40 flats and 60 Bias frames
Flats histogram is around 8500 to 34,000 ADU or up to half way
Flats without filter usually around 0.5 sec exposures
Flats with a dual band filter 5 to 7 sec exposures but no longer
Bias are set for shortest exposure for the 2600 series camera which is 0.000032 sec
Cheers
Martin
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