Meaning of focal length
Focal length
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Digital photography
Glossary of photography terms
Meaning and definition of focal length :
The distance, usually given in millimeters, between the optical center of a lens and the point at which rays of light from objects at infinity are brought to focus. In general, the greater the focal length of a lens, the smaller and more magnified the part of the scene it includes in the picture frame. A standard lens for a 35mm camera typically has a focal length of 50mm, a wide-angle lens one of 28mm and a telephoto lens one of 135mm.
For the term focal length may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for medical and legal or special purposes.
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Glossary of photography terms
Focal length
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