It may be a simple question: what is ISO in photography? However, the answer isn't quite so straightforward – mainly because it's a term that originated before digital imaging. So, let's rewind ...

If the ISO is simply too high, your only option is to reduce your shutter speed. However, this kind of photography is where noise trumps blurry images.

With ISO, the lower the number, the more light you need to achieve a good exposure. For example, ISO 100 is best suited to being used with studio lights or bright sunshine.

However, we think the exposure triangle can be a simple and effective way of understanding how ISO, aperture and shutter speed are associated, and how balancing them allows photographers to create ...

This is usually expressed in the order of a shutter speed value at a given aperture and ISO - say 1/60 sec at f/8, ISO 200. In the camera's automatic and scene modes, that's about as far as it goes.

Stops can refer to adjustments in any three areas of of the "exposure triangle", aperture, shutter speed and ISO. The balance of these three fundamental concepts make up the soul of any photograph.

ISO is measured in numbers, which are usually in multiples of 100. Earlier, manufacturers used to stick to doubling the value where the range went from — 100, 200, 400, 800, 1600 and so on.

Photography Bay has posted a very useful, and rather interesting, comparison of high ISO shots from the brand new Canon 5D MkII and Nikon’s low-light superstar D700. The image above shows the ...

This is usually expressed in the order of a shutter speed value at a given aperture and ISO - say 1/60 sec at f/8, ISO 200. In the camera's automatic and scene modes, that's about as far as it goes.