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H.
Just to clarify, I take my Flats using AV Mode on the camera with a Light Box so the camera automatically sets the Exposure, with high ISO Subs I believe you can set the ISO on the AV Mode a lot lower as that is not an influence on final image therefore your actual Flats can be taken at a relatively fast exposure speed.
My normal working ISO is 400 to 800 anyway. Everything is taken in RAW.
Cheers
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