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Digital cameras have a much wider range of ISO sensitivity settings and you can change the setting shot by shot. This is immensely liberating. In fact it’s one of the best things about digital, and it doesn’t get half the credit it deserves.

Jack Bauer, Tour of Britain 2010 (Jon) High ISO allows action shots even in low light – notice the car headlights (ISO rating 800 and shutter speed 1/1600 sec)

With film, you really only had two controls to play with – aperture and shutter speed. If you wanted to set a small aperture to give good depth of field, you probably had to set a slow shutter speed to maintain the overall exposure level. Now you have the option to increase the ISO level as well, which may allow you to keep the shutter speed the same. This doesn’t just add to the possibilities, it multiplies them.

Most cameras now can vary the ISO automatically to suit the shooting situation. However, if you’re into taking control of the camera (and we repeat, it’s a good idea!), then just remember there are three fundamental controls, not just two.