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DSS is useless for OSC CCD's, unfortunately. Seems OK for DSLR, but never got any meaningful result out of it with an OSC CCD.
The only one I recommend is CCDStack - it instantly recognises the camera based on the FITs header, and asks some questions.
You then need to debayer the FITs, BEFORE registering/stacking them. That is important - you MUST do it prior (but if CCDStack auto-recognises your camera, it seems less of a problem). CCDStack has a debayer button on the toolbar, top right.
Then calibrate, register, normalise, data reject and then final combine - Mean, Sum, Median, Maximum, Minimum...
CCDStack is WELL worth the money. I only use OSC now (SBIG ST-8300C), and it handles the files impeccably, even including H-a files made using a filter on the face of the OSC.
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