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What does the ISO feature of a SLR Digital Camera does?

I am a SLR Digital Camera beginner. I have the Nikon D90 and I am wondering what the ISO does to the picture? Does it determine how bright the picture comes out?

It determines the film speed on a regular SLR camera.
Pretty much the same thing on a DSLR.
If you raise the ISO above 100, you will be able to use a higher shutter speed. Thus, preventing blur.
The higher the ISO, the less light needed to make an exposure, allowing higher shutter speeds or smaller apertures.
However, using a higher ISO might cause a "grainy" image.

Basic Digital Camera Operation : Digital Camera ISO

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