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On zoom, I agree Simon. I have since taken each of the CR2's and tweaked them in PS 5.1 RAW tools, and will try a restack - the first stack by DSS revealed more like airy discs for stars than stars,, and visible field rotation patterns (and thta is set at a 50% detection rate to minimise sampling noise or faint stars).
The first single sub at top was taken with Canon long exposure noise reduction OFF (CMOS showing 24°). If I use LE noise reduction ON with the Canon, there is no need whatsoever to use darks (and usually not even flats!) in DSS. Just takes twice as long, meaning a decent stack of Eta Carinae complex is probably 3 or 4 nights work. The longer between sub wait is frustrating, but in my opinion after this trial, WORTH it, as I honestly believe Canon does a better dark reduction than DSS does.
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