Focal length is a distance between the entrance lens and the image sensor where rays of light are focused. The lens focal length and the size of camera sensor determine a CCTV camera field of view. The shorter the focal length, the wider the field of view.
In the past rotating focal length calculators made out of paper were good and simple tools for quick calculation of the field of view.
Now it is time to use comprehensive CCTV CAD /CAE software for CCTV design, like CCTV Design Tool or IP Video System Design Tool.
Apart from the focal length calculator this software has 3D engine for automatic design and visualization of all elements of video surveillance systems.
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