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CCTV lenses can make your camera set up just perfect. Choosing the right lens is not easy, but learning how and why to pick certain lenses can be a rewarding strategy for maximum performance of your CCTV security and surveillance system.

You must learn and understand the basic CCTV lingo. For example: The Lens Focal Length is measured in mm, so the larger the number the narrower the angle of view. (e.g. 2.5mm is a wide angle of view and 16mm is a narrow angle of view.) Depth of Field on a lens is the distance within which objects in a picture are in focus. A large Depth of Field means almost all objects in the Field of View are in focus. Using a wide angle lens, a high F-stop, and an auto iris lens are things you can experiment with to get a greater depth of field. CCTV cameras come in different formats which determined the size of the CCD. The CCD of camera affects the angle of view.
Other CCTV terms:

F Stop: F Stop or Aperture has 2 measurements. When the lens is fully open (Maximum Aperture / Minimum F-Stop), just before the lens completely closes (Minimum Aperture / Maximum F-Stop). F Stop - is the lenses ability to gather light depending on the aperture and focal length.

C or CS Mount: The 2 standard CCTV camera lens mounts. The difference between the two is simply the distance between the lens and the CCD image sensor. C Mount - 17.5mm CS Mount - 12.5mm

Auto or Manual Iris: For changing light conditions (e.g. cameras positioned outdoors), Auto Iris lenses are needed. For indoor use manual iris lenses are sufficient as light levels will not vary too much.

Video or Direct Drive: The majority of CCTV Cameras will be able to use both types. Video Drive Lenses contain circuitry which converts video signal from the camera into iris control. Direct Drive Lenses require the CCTV camera to contain the circuitry.

We also carry the complete line of computar CCTV lenses. Please click on the link to access the computar website "Search for Computar Lens" and once you have found the lens you want, call us or contact us via e-mail with the model number of the lens so that we may provide you with a quote and further instructions.

Camera Lenses