First CCTV lens calculators were wheel calculators made out of paper.
Such wheel lens calculators are very easy to use. To start you should select CCD Sensor Format (like 1/3″) and then you can rotate the wheel to choose the desired field of view (FOV).
Picture 1. Old CCTV Lens Calculator and Online CCTV Lens Calculator
Now CCTV lens calculators made huge step forward and jumped from paper to PC. Currently there are many Online CCTV lens calculators for web browser but the most comprehensive ones are made as a PC software for example our graphical lens calculator / CCTV design tool:

Picture 2. Example of graphical CCTV Lens Calculator
Actually it works the same way, but using a modern software with the cctv lens calculator function you can not only calculate the viewing area or focal length, but also to see the actual field of view in a horizontal and vertical projections, put test persons & test walls and immediately get a camera 3D preview. Apart from these functions you can design all other system parameters, like network bandwidth and storage space.
Don’t hesitate, just download the cctv lens calculator from here , read user comments or see video tutorials.
Explanation:
Camera format (Sensor Size) - Video camera’s CCD chips format; 1/4″, 1/3″, 2/3″, 1″ etc.
Field Of View (FOV) - The width, height or diameter of a scene to be monitored. Usually determined by the focal length of a lens, the sensor format and the distance to the objects. See: CCTV lens angle
Focal Length (FL) - The distance from the center of a lens to the focal point (sensor). The longer the focal length, the narrower is the angle of view.
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