Depth of field refers to the range of distance that appears acceptably sharp. It varies depending on camera type, aperture and focusing distance, although print size and viewing distance can also influence our perception of depth of field. This tutorial is designed to give a better intuitive and technical understanding for photography, and provides a depth of field calculator to show how it varies with your camera settings.
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Understanding depth of field is in Photography 101, but this tutorial brushes up on controlling just exactly, what you want in your photograph to be sharp and the background to be in soft focus.