This tag is used for exposure levels and the "levels" tool in photo processing software. Don't use it for the horizon-alignment device.
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Is there any noise difference between averaged and long exposure photos?
Let's suppose I'm on a tripod, photographing a perfectly still scene (also dark) and I take these photos:
5 photos at ISO 3200 and 1s exposure
1 photo at ISO 100 and 5s exposure
There is a common ...
