Canon FD Lens, Руководство пользователя

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Depth of field, the range of sharpness in front of and behind the
subject on which focus has been set, is best understood by ex-
amining the photographs below. When the majority of subjects
appear sharp in a picture, the depth of field is great; when they
appear sharp within a narrow range, the depth of field is small.
Depth of field varies according to the focal length and bright-
ness of the lens used and the distance from which the picture
is taken.
How focal length and aperture affect focus range — Depth of field.
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