20
Nov
08

What is ISO?

canon_eos_rebel_xsi_04

In Digital Photography ISO measures the sensitivity of the image sensor. The same principles apply as in film photography – the lower the number the less sensitive your camera is to light and the finer the grain. Higher ISO settings are generally used in darker situations to get faster shutter speeds (for example an indoor sports event when you want to freeze the action in lower light) – however the cost is noisier shots. I’ll illustrate this below with two enlargements of shots that I just took – the one on the left is taken at 100 ISO and the one of the right at 3200 ISO (click to enlarge to see the full effect).

From the Digital Photography School Article, ISO Settings in Digital Photography


AND
Don’f forget the last part….

Many photographers have been disappointed at the end of a shoot to find that they’d forgotten to check what ISO setting they’d left their camera on in their last shoot. There’s nothing worse than thinking you’re shooting at an ISO of 100 only to find you forgot to switch it back from 1600.

To help with this always check your ISO setting before starting to shoot – but also try to always switch it back after a shoot.

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