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In practical applications, there is often a user proposed that the CCTV Lens can see how far the object or the camera can see how wide the scene, which is actually determined by the choice of lens focal length, also with the select camera resolution and monitor resolution. Theoretically, any kind of CCTV Lens can be shooting very distant objects, and camera imaging target surface into a very small like, but subject to the limitations of the pixel, less than one pixel of the image sensor when imaging small to size, they no longer can form the subject of the like. 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. 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. One of the handiest and most economical design tools is CCTV Lens Owning a CCTV Lens means having a choice between three specific lenses only, but it also means that you can use almost any other lens; provided that you buy an adapter and that you're fine with manual focus that the lens has an aperture ring. Do you wait for anything no longer and quickly take a action to have one and enjoy the life. Source from: http://www.spycameraeshop.com/blog/One-of-the-handies-and-most-economical-design-tools-is-CCTV-Lens/ 
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