The type and size of lenses perform important role in determining what video is captured by the camera. But the big question is this how to choose CCTV Camera Lenses. It is essential that your CCTV adviser or you, choose the right lens for the job. There is some basic instruction for choosing lenses.
Vari-focal or Fixed lens
- A Fixed camera lens means the camera lens cannot be zoomed. Fixed lens are generally less costly so can be a good option for fixed area such as a room in a house.
- A Vari-Focal camera lens can be adjusted by CCTV technician manually, you can focus it on exactly the area that you wish to record. It has flexibility to be adjusted at a later date if the area layout or your requirements change.
The effect of lens size and distance
The size of the CCTV camera lens will affect the viewing angle of what the camera sees. The distance the security camera is mounted from the object also affects what image is recorded. The examples below show the same area captured by two common fixed lens sizes – 3.6mm and 12mm – and three different distances.
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