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GENERAL INFORMATION
Many years ago there were only about five types of security cameras available in the security systems market. Today things have changed considerably. At one time there were only tube security cameras. Today all of the security cameras we use for closed circuit television (CCTV) use a special computer chip called a CCD. These chip security cameras are much less expensive to produce as well.These security cameras are a lot more dependable than their tube counterparts, and produce a much better picture. All of these factors have made the use of CCTV much more affordable and practical for a wider variety of applications than ever before.

Lighting
Proper lighting or illumination is very important in the world of CCTV. If an object is not illuminated it is very difficult to produce a viewable picture. Fortunately there are security cameras that can work in very little visible light. We now have security cameras that can "see" with infrared light. This can be quite useful if your CCTV application requires your security camera to work in the dark. Infrared light is invisible to the human eye, but to a security camera that is sensitive to this type of light it may appear to be daylight while remaining dark to the observer. 

Lenses
The lens of a security camera is like the cornea of your eye. Without it you can not see, and neither can the security camera. There are many different types of security lenses in the security camera market. The first division between lenses are the wide angle and the zoom lens. The next division is between the auto iris, manual iris, or no iris at all. These choices and others depend on the intended use of your security camera system. Correct security camera lens choice should be determined with your CCTV technician

There are many  factors involved in choosing a suitable lens are given on the CCTV Camera Lenses.


 
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