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Old 15-06-2014, 03:59 PM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is online now
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,029
help me here....
Neglecting vignetting/ shadowing/ fringing (the usual target for flats...)
Why would dividing by what I see as an "evenly illuminated but random pixel distribution" image improve the SNR????
What is it actually doing to the signal?
For AP I can see the background "graininess" caused by the low SNR.....
but I can't see how dividing by basically a "constant" is going to lift the target signal above the background and effectively add to the SNR???
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