Sorry all, I should have clarified.
This is using darks and flat darks too. The flats are 30 seconds long, flat darks are also 30 seconds. The light frames are 240 seconds and the darks are also 240 seconds. All images taken at -10C, 120 gain & 2x2 binning on the 249MM. The flats are taken using a flat pannel at night, so no t-shirt method or other.
This is all done in NINA, with the exact same settings between image types. I will try DSS and report back. Hoping it's just a weird setting in PIX.
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