Category: sensitivity to light


By , April 24, 2010 7:39 pm

ISO stands for International Standards Organization. It is the film’s sensitivity to light. The ISO lets your light meter know exactly what combinations of aperture and shutter speed it can use to record an exposure. The higher the ISO number is, the less light that is needed to make a picture. The lower the ISO number is, the more light that’s needed to make a picture. Higher ISO numbers can make the image grainier but it depends on what you want in your exposure. A higher ISO might be good if you want to freeze the action in sharply focused detail.

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