Thanks Stan. I will do some investigating as suggested and repost as needed Regards Daveglibbins2003
also - a light leak can ruin flats (e.g. scattered light may be more intense in the light frame than the flat or visa versa).stan_ccd
maybe 38k ADU is too high for that camera (esp if it is ABG) Or it may mean you are not subtracting the bias (or dark) from the flat or light frames. Or maybestan_ccd
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