how to choose right CCTV camera lens?
Here, we are discussing how to choose right CCTV camera lens. If you are going to get install CCTV camera at your premises then you have to know about some points about CCTV camera. As we all know every kind of camera has a lens and it plays the main role in the quality of the picture. So if we want to understand the technical points CCTV camera then first we have to know some about the lens. The lens is not only responsible for the quality of picture but it is responsible for the amount of area camera covered. So there are some basic points about camera lens and after understanding those point you are able to choose right CCTV camera for your premises. So let’s get started.
The aperture of the camera is the hole if lens where light enters into the camera. It is measuring in f-stop. In simple language, the wider aperture in the lens has less ability to capturing the far object and near object. For example, suppose you want to take a picture of a person at outdoor then you want to have only focused on the person, not at background then you need to a big aperture. It can be quite confusing, so remember the simple rule, higher the f-number means, the sharpness of nearest is farthest object tends to equal.
Iris controls the light passing through the aperture. Iris of the camera is responsible how much light is passing through its aperture. It does not mean that wider the iris, the image is better but it should be in controllable amount. If more light passes then it washes the image and if low light passes then the image will dark.
Sometimes we need auto adjustable iris camera mostly in outdoor cases. In indoor small areas, you can use fixed iris camera.
3. Field of view
Field of view is simply a term which is used to define how much area( in width ), lense allow to see. FOV depends upon the focal length of the camera. Higher FOV means you are able to see the higher wide angle. If FOV is high that means you are able to see wider area but less far area.
4. Focal length
The Focal length defines how far the camera can see. Focal length measuring in mm. You generally hear 2.8mm lens or 3.6mm lens. So what is means, that means a camera which has 2.8 focal lengths are able to see wider than 3.6mm focal length. So it is very necessary to choose right focal length camera according to the area. In general, In the smaller area, fewer focal length camera should use.
So these points you should be considered before applying a CCTV camera at any premises and hope now you got how to choose right CCTV camera lens.
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