Calculate the lens requirements for your surveillance application

 

1. To find the focal length of the lens you need, enter the target distance of the object to be viewed, and the required field of view H (horizontal) x V (vertical). Example: The item to be viewed is a entry door 20' away, and a 10'x10' field of view is desired. The calculated result is a 7.2mm lens. Either the H or V may change to fit the viewing format.

2. To find the field of view you can expect with a specifc focal length lens, enter the distance  to the object to be viewed, and focal length of the lens.  Example: A 4mm lens is on the camera and it is 30' away. The calculated results for the FOV are 36' x27'

 

NOTE: The calculator assumes a 1/3" imager is in use.