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andy_ppp
on Oct 13, 2016
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Cooled Nikon D5500a Chills the Sensor for Clearer ...
Would combining Peltier coolers with CMOS/CCDs on high ISO photos work? How much of the noise at higher ISO is heat, little I'm guessing?
Sanddancer
on Oct 13, 2016
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Quite a bit, actually. It's why high end telescope CCDs do similar things. A high ISO means you're ramping up the gain, so the bits of random noise get amplified too. Cooling it means you're getting rid of one of the more significant sources.
abakker
on Oct 13, 2016
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You'll notice on this page -
http://www.primalucelab.com/astronomy/d5500a-cooled-camera.h...
- that the before/after photo is taken at ISO 6400.I consider that to be reasonably high ISO. But yes, at some point, heat is not the primary issue anymore.
wlievens
on Oct 13, 2016
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On a CMOS higher ISO is just increased analog amplification. If your pixel is measuring thermal noise the. You will amplify that too I guess.
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