Quote:
Originally Posted by Shiraz
I don't quite understand what you mean by signal being lost in background noise
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I must have expressed it badly for a given temp/ccd/gain/exposure noise will be fixed whereas signal will vary with the brightness of the object, thus for a short exposure faint details are lost as they cannot be distinguished from the noise. We use longer exposures or multiple exposures to deal with this.
I take your point re s'ware binning but it has been my experience that s/n is better with hardware binning - I guess it depends on the chip.