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#1 |
Senior Member
Join Date: Dec 2002
Posts: 5,803
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A question in another forum here (canon SLR) got me thinking.
What are the major causes of noise at higher ISO settings on digital camers? I seem to remember reading that it was the CCD/CMOS heating up. Is that it? Is there another cause? |
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#2 |
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Join Date: Jun 2002
Location: Hay River Township, WI
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There isn't more noise with a higher ISO. You are using less light to get the image so there is less "signal". It is the signal/noise ratio that really matters - you don't care if there is more noise so long as there is also much more signal.
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#3 |
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Join Date: Aug 2002
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People say there's more noise because it's the K.I.S.S. (Keep It Simple S(fill in the blank)) method of explaining it. Just think of the human eye, in a dark room with very little light you will see less colour because the colour sensive rods are less sensitive to light then the cones, and you will see a grainy image as well. Also people are used to higer ISO film being grainy so that's another way to explain it.
So why have higer ISO's on a digital camera? Basically so you can take a handheld shot in lower light (keeping the shutter speed at 1/30 of a second or less). |
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