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Thought I'd post a couple of pics that show the results with the poor flats.
Horsehead nebula , 11x270s QHY410c, low gain mode, gain53,9degrees, ED100, SharpCap, dithered. Stacked in DSS.
One processed in SIRIL and noise reduced in ImagesPlus.
Second processed in Startools.
Cropped out a lot of vignetting rubbish...
I tried reducing gain to zero and differing exposure lengths. Gain didnt seem to change the flats but there was some improvement lowering the exposure time towards ADU range 8-12k so I'll work with that.
GlennB
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