Have I Grasped Iso Correctly

markandhisfish

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from reading about iso i get the impression that its all related to light? am i right in thinking that where more light is available you would use a lower iso and at lower light a higher iso?

and is an iso range of 100-3200 good?
 
yes, thats right.

A lower ISO for bright subjects, and a higher ISO for dark subjects.

Bear in mind the higher the ISO the more sensitive to light the image sensor is, which creates something called 'noise' on images.

Newer cameras tend to surpress noise alot better than older ones, and DSLR's do it alot better than compacts as they have larger sensors.
 
Gaz is pretty much spot on, but to elaborate a bit -

Every time you double the ISO (e.g, from 100 to 200, or 200 to 400), the camera's sensor becomes doubly sensitive to light. This means you can shoot in lower light, or use a faster shutter speed (to stop motion blur) or a smaller aperture (for a bigger depth of field - more stuff will be in focus). The downside is an increase in noise, which will be more or less noticeable depending on the camera.

100-3200 is pretty standard, but be aware that you might not want to use the higher settings because of noise.
 

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