Lens Calculator

There are a couple of ways of calculating the perfect lens size.

1. You can try to work it the hard way with this formula f = c x d/w (see below for how to do this, OR…
2. Do it the easy way using our free lens calculator tool.

You don’t have to be a CCTV expert

Simply enter the rough distance between the camera and the subject you wish to capture plus the focal length of the lens you are considering. The handy tool will then give you estimates on the horizontal and vertical distances you can expect to cover with a 1/3” or a 1/4” CCD camera.

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Operating System	Microsoft Windows 7 or later
Processor	Intel i3 minimum
RAM	32Bit Windows: 4GB / 64Bit Windows: 8GB
Screen Resolution	1024 x 768 minimum
Hard Disk	Requires approximately 8Mb

Licences	1 per PC
Support Period	3 Months ticket based support

*Downloads within the support period are available via your personalised Control Panel.

How can I calculate what lens I need for my CCTV security camera?

You can do it in two ways.

The old fashioned, time consuming way of using a formula such as this f = c x d/w where f = lens size needed (mm), c = chip width (mm) 1/3” CCD = 4.8mm or 1/4” CCD = 3.2mm, d = distance of object from camera (m) and w = width of view required (m)

If that seems a little too complicated you could always do it the easy way with our Free Lens Calculator tool. Just enter the distance from the camera to the object you want to monitor and the focal length of the lens you’re considering. The tool will instantly tell you what you can expect to capture.

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