When to use ISO

NPhoto - - Special Feature -

Let’s say you’re shoot­ing a foot­ball match in the win­ter, where you know you need a shut­ter speed of 1/500 sec:

When it kicks off at 3pm, the day­light is still quite good and you can shoot with an ex­po­sure of 1/500 sec at f/4.

By half-time, the light has fallen by 1EV so that you have to in­crease the lens aper­ture to f/2.8 to be able to get the same shut­ter speed.

Dur­ing the sec­ond half of the match, though, the light drops a fur­ther 1EV and you’ve al­ready reached the lens’s max­i­mum aper­ture. The so­lu­tion is to in­crease the ISO in­stead, from ISO200 to ISO400.

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