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Chris, when you used the Canon in the past, whar a did you use for capture? How are you shooting the Darks and Bias frames and what does the histogram look like? Negative values seem impossible for Darks and Bias, but they will display a histogram slammed up against the left hand (0) margin. You mention FITS but why? If your capturing Darks and Bias with the DSLR they should be RAW files. Can you pull them up in BYEOS and check them?
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