A Guide to Understanding ISO in Photography
ISO is a measure of the sensitivity of your image sensor
"Now, the question is how does it work? When data is first read off of
your camera’s image sensor, it’s in the form of tiny, little electrical
charges. Before those charges can be analyzed, they have to be
amplified, because they are very minute signals. When you increase the
ISO setting on your camera, all you are doing is turning up that amplification.
Now, because it is more amplified, weaker light levels are more
significant, so you can get away with less light, which means shorter
exposure times or smaller apertures."
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