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The fact that the ASI1600 only has 12 bits isn’t that important. The 6D at its lowest ISO only has 11.38 bits of DR even if it does output 14-bit images. The ATIK 16200 sensor has 12.1 bit although the FLI16200 might be as high as 12.7 bits in a 16 bit file.
The ASI1600 is about 12.5 bits so you up the gain until you only have 12 bits. On my QHY163M that is at 80 gain but it is 75/76 on the ASI1600. What makes a camera like the QHY367M (Nikon D810) is that it has about 13.85 bits of DR! That’s why the D810 needs 14 bit files.
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