You may be familiar with the ISO setting on a camera, but what does it actually do? We break it down for you and tell you when you might want to use it.

Adjusting your camera's ISO setting varies between devices, but most DSLR cameras will either have a dedicated ISO button, or a quick menu where it can be adjusted manually.

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You could describe aperture, shutter speed and ISO as the building blocks of making a photo, and absolutely essential concepts if you want to have full control over your camera.