Fixed focus
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A camera with fixed focus has no focus control. The focus is preset once and for all, at a distance for which the depth of field will suffice for most subjects. With a slowish and moderately wide lens for a frame (negative, slide, or CCD) of 24×36mm or below, the depth of field may go from one meter to infinity.
Fixed focus is generally only used on cheaper cameras, whether old (box cameras), newer (disposable "single-use" cameras) or contemporary (mobile phone cameras).
Until the 1980s, the next stage up in versatility was guess focusing; more recently it has usually been autofocus.
- This article was originally based on one ("Fixed_focusing") in Camerapedia, used under the GNU Free Documentation License.
