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The CCTV Lens that the lens of surveillance cameras, surveillance cameras just a single video capture device, the pixel and resolution of the lens is higher than the computer's video head but could not keep up with a professional digital camera or DV. But according to the character of CCTV lens, some field curvature remains, which can ensure the system has a high resolution. They have a lot of different features and it is a good idea to know some of the different ones available and how they affect your surveillance system or your security cameras. Just as with an auto iris, a CCTV Lens with an auto focus is able to adjust its picture to gain a focus on an object automatically. This is useful if you don't mind a wide focus range, but if you want your focus to be specific on a certain object, then you will want to be able to adjust your focus manually. To begin with when someone is talking about a CCTV Lens focal length, it is related to how wide or narrow your image angle will be. The smaller a lenses focal length, then the wider the image viewing angle will be. Adversely the larger the focal length, the narrower you’re viewing angle will be. It is worth to attention that When do electronic surveillance devices such as computers, video cameras, and telephone monitoring step over the line from "effective management controls" to” intrusions on People rights"? I think you should know this when you use the CCTV Lens before. Using a CCTV Lens selector wheel helps in finding the correct lens, but does not give the customer any idea of what they will be seeing. Viewfinders, on the other hand, will help in selecting the correct lens and give a view of the image. One of the handiest and most economical CCTV design tools is the CCTV Lens selector wheel. This circular sliding calculator is a compact, lightweight tool that should be in every CCTV pacifier’s pocket. These calculators are typically available at no charge from your favorite distributor or CCTV manufacturer. We needn't worry so much about CCTV cameras taking away our liberty. There are many types of lenses except CCTV Lens; each lens has its own characteristics. Depending on the function and structure, the price of these lenses is a very big difference, such as high power zoom lens than the average fixed focus lens price is about 10 times, so only a proper understanding of the characteristics of a variety of lens to be more flexibility to choose the lens. You should know there are few different types of CCTV lenses out there you can choose the best and suit for yourself one. Source from: http://www.spycameraeshop.com/blog/How-CCTV-Lens-affect-your-surveillance-system-or-security-cameras/ 
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