Recently I experimented with acquiring light frames sans dark frames in SharpCap. The result was ugly. For reasons still a mystery to this imager Autostakkert! could not correct for vignetting when the session flat frames were applied.
Autostakkert does offer the option to apply the dark frame during stacking but this did not work either. Hmm? Astro-imagers often promote DeepSkyStacker for stack averaging astro images; so I gave it a try. DeepSkyStacker rejected my .png flat frame as an unknown format and rejected it's converted to .tif format as the wrong color. These files are readily accepted by Autostakkert! which was used to stack average the images without using the flat.
Thanks to careful some cropping in GraXpert gradient remove software, the descent images below were resulted after post processing in PaintShop Pro 2021
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IC 5146
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| NGC 7380 |
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| NGC 7538 |
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| NGC 7635 |
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| Sharpless 112 |
