Axis Communications - AXIS M1113 Network Camera

the zoom factor of the lens is a property of a camera system that is often misunderstood when the camera needs to see really far away it's easy to believe that a higher zoom factor always accomplishes this better regardless of other factors a zoom lens is continuously variable between two different focal lengths which means you can change the level of magnification without switching the optics when a zoom lens is rated at 5 times this means the longest focal length divided by the shortest equals 5 or if we reverse it the wide-angle focal length times 5 will give you the maximum telephoto focal length if we compare a 28 to 80 millimeter lens with a 70 to 200 millimeter lens on paper both are listed with the same zoom factor 2.9 however the 70 to 200 will actually give you 2.5 times more magnification than the 28 to 80 lens moving past the mirror optics sensor resolution is also important