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Doesn't the QHY version have a DDR? The original versions of the ASi1600 do not have a DDR. Is this a factor to be considered when comparing the bias and dark performance? Right side AMP Glow certainly is a factor in the ASI1600 subs at long (>=300S) narrowband lengths. If your shooting mostly short (<60s) sub broadband then it is not a concern. I agree it's not linear in my experience. Shooting Dark Flats, seems to me, to be an un-necessary overhead, when i already have a great library of Bias and Darks. I have read some of Jon Rista's commentary. I have seen no evidence of banding in the Master Bias of my 1600MM-C.
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