Guide to calculating the lens for Security Cameras

The correct choice of lens for a security camera is a fundamental factor for a correct installation. Depending on our needs and the final location of the surveillance camera, it will be necessary to pay attention to this characteristic.

With the following CCTV lens calculator it is easy to make these calculations:

1. Take into account the camera format (Camera Format). This is to be found on the camera's technical data sheet, although it is usually 1/3 or 1/2.
2. Set the distance between the camera and the lens. You can do this with the vertical scroll bar on the left of the calculator. Object Distance.

On the television screen we will see how the person adopts a size that we can vary depending on the viewing frame we want. We can increase the height and width around the viewing frame we want to have (Object Width and Object Height). To increase or decrease this size you have to touch on the Focal Length.

When we find the frame of view that suits us, we will tend to the value of the focal length. Keep in mind that we should not go outside the market values. A camera with a variable focal length is usually between 2.8mm - 12mm.

Fixed lens cameras are usually 3.6mm. So if the focal length we have calculated is not 3.6mm we would have to buy a varifocal camera.

Another way to calculate all this data if you want to use a fixed lens camera, is to first set the focal length to 3.6mm and then vary the distance between the camera and the object.