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Hi Paul,
I don't think using flats makes a big difference to the look of your photo. I only use them because the WO field flattener gives me vignetting in the corners.
All my exposures so far have been 10min at -20c. I did a set of 15 dark frames at these settings back in February and I have used the same ones ever since. It seems to still work.
I don't manipulate the shots at all in DSS. Once they are stacked I save a Tiff file and import it into Photoshop CS3
In DSS's "recommended Settings" I always make sure I have chosen "RGB background calibration". This lines up the histograms for the 3 colours, given me less colour balance problems in CS3.
I use EZYCAP to capture my shots.
Ross.
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