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Thanks guys, appreciate the replies. I guess the basic question is: does getting above the read noise improve the colour data more than the loss of resolution detracts? Hard to say I guess.
I'll have a look at doing a software bin soon and see what it looks like. Won't be quite the same; I'll have a bit more dynamic range from deeper wells and less read noise, but it should be in the ballpark.
The other question is: how important is it really to be sky limited. I know it's ideal, but when we're talking dark skies with a camera that has only 5.4e- of read noise, makes me wonder whether it's really worth it...
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