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Hi Lewis,
the "column defect" is not actually a column defect - it is a hot pixel that causes a bleed down the column - this was how SBig explained it to me (It doesn't run down the whole column) . I used to calibrate using master darks and master bias frames. The Bias frames got rid of the "column defect". I had no problems using a master dark library. Nor did I have any issue with scaling darks - as long as I used bias frames. Not sure ow Maxim does it, but I bought Astroart which I found much easier to use.
cheers
Gary
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