A CCTV camera lens size determines the field of surveillance view and zoom level that the camera provides. This is often referred to as the ‘Field of View’ (FOV).
The larger the size of the lens, the more narrow and zoomed in the field of view is. Some of our fixed lens cameras come standard with a 3.6mm (Analogue) or 4mm (Digital) lens.
A 3.6mm lens is designed to provide an approximate 72 degree field of view.
If you need precise adjustment to the angle and field of view for your application, a varifocal lens camera is recommended so that you can adjust the lens to the exact view that you need. This is more often a range of 2.8mm – 12mm. These varifocal cameras are not required in most scenarios but rest assured that Hikvision will have a camera to suit your requirements.
We have produced two internal screenshots for you to get an idea of the difference just 1.2mm can make. As a point of reference, the area covered is a porch and is approximately 1m x 2m in size.
2.8mm
4mm
As you can see from the comparison a 2.8mm lens gives much more coverage of this area, however this doesn’t always mean that a lower lens is better. There will be situations where a more zoomed FOV is required.
Still not sure about what works best for you? Give us a call on 0800 772 0822 and we would more than happy to discuss it with you.
Please Note: We do not provide advice on lens type or sizes for those wishing to carry out a DIY installation.