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Focal Length


Surveillance Education Category:
Glossary
Author: Tyler Norris

Focal length is measured in mm or inches, and is the distance between the optical center of the lens and the point on which it focuses.  A lower focal length results in less magnification with a greater field of view, and vice versa for longer focal lengths.  Security cameras usually have a focal length of ¼”, 1/3”, or ½”.

This is very closely related to the FOV (field of view) of a camera.



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