Focal Length
Focal length of a lens for a security camera is measured in mm, 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 (FOV), and vice versa for longer focal lengths. The lens of a security camera can be either be fixed, meaning it can not be adjusted, or varifocal, meaning it can be manually adjusted. Typical fixed focal lengths are 2.6mm and 4mm. Typical varifocal lengths are 2.6-6mm, 4-9mm, 9-22mm and 5-50mm.
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