Depth of field preview

A function available on some digital single-lens reflex cameras that displays a picture in the viewfinder that corresponds to the aperture that will be used to expose the photograph. This function is typically implemented as a button. This provides a visual sense of the amount of depth of field that is present, as well as which sections of the final picture will be crisp and which parts will be blurry. This is important because the viewfinder typically only displays the image in the manner in which it would appear if the aperture was opened up to its widest possible setting.


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Martin Kaninsky

Martin is the creator of About Photography Blog. With over 15 years of experience as a practicing photographer, Martin’s approach focuses on photography as an art form, emphasizing the stories behind the images rather than concentrating on gear.

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Depth of field scale


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