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It was all double-dutch to me to start off. Read the Nebulosity manual (free) and it explains the whole shebang. I made a light box with the assistance of Peter_4059 (thanks Peter) and made my flats using this. Ive included one of my recent flats made in nebulosity. If you run pix maths over it you will see it had a pix 0f ~9200 max. This is what I aimed for according to Marc and it worked brilliantly resolving the vignetting and small dust spots. Took Bias frames which you also need to determine the gain and offset to use (again see nebulosity manual). For the QHY8 I would get Nebulosity as it makes image aquisition very easy.
Regards, Allan
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