It is very important to use the right lens for desired field of view; otherwise the images on security cameras will not be satisfactory. CCTV security camera lens with fixed focal length are less expensive and give smaller distortions but do not offer flexibility in terms of  field of view choices.

Here is the new 3D Online Lens Calculator with a built-in camera database. As a better alternative you can use IP Video System Design Tool, our professional CCTV design software. With that tool you can load a site map, add multiple cameras and see how modification of any installation parameter can affect the camera coverage.

Few years ago most of camera manufactures used camera lenses with normal lens and viewing angles for such lens could be calculated using usual ArcTan() formula.

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A camera lens takes all the light rays bouncing around and uses glass to redirect them to a single point, creating a sharp image.

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Avoid using commonly available online lens calculators because modern wide-angle cameras have non-standard wide angles (like 110 degrees instead of 85 degrees calculated by outdated Field of View calculators), and only a FOV calculator with a built-in database of camera models can show correct angles and calculate FOV precisely.

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Also for a proper lens selection you should consider both camera installation height and object height. Without taking all these parameters in the picture, the calculation error can exceed 30%.

Built-in camera FOV calculator displays the range of viewing angles for the selected wide angle camera with variofocal lens.

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Camera Field of View on 2D site plan (different colors represent camera zones with different pixel density): Calculating Field of View for cameras on the imported site map or floor plan.

In everyday language the Field of View of Field of Vision, abbreviated as FOV, refers to that area which is visible through any optical instrument, which could be the human eye or a lens. This definition can be applied to the CCTV parlance and FOV can be defined as the width or height of a scene to be monitored by the security camera.  In CCTV Field of View depends on a number of factors such as the sensor format, the focal length of a lens, and the distance from the objects.

The only way to calculate the horizontal angle or field of view is to use manufacturer’s data and therefore tools with database of camera models, like IP Video System Design Tool show the correct result:

For example for Hikvision DS-2CD2622FWD-I(Z)(S) the manufacturer has the following angle range specified: from 35 to 106 degrees. Ordinary lens calculators will give a wrong angle range, most likely: from 24 to 85 degrees.

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