Understanding how the three elements of exposure work — aperture, shutter speed, and ISO — and how to use them will help you master your digital camera.

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Lenses with a very wide maximum aperture are often called 'fast' lenses – wide apertures allow faster shutter speeds. Aperture and ‘depth of field’ It’s not just about exposure, though.

F-stop is a consistent way to measure lens aperture, and helps photographers control exposure and depth of field. It is noted with an f followed by a slash and number, for example f/2.8.

Good exposure is achieved when the aperture, or size of the lens opening, shutter speed and sensor se. Chron Logo Hearst Newspapers Logo. Skip to main content. Newsletters. About Us.

A photographer has to consider the lens aperture and shutter speed, both of which control how much light hits the film. A smaller aperture means less light, as does a faster shutter speed.