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Lens

Lens - A lens is an optical device which bends light, focusing it on onto a image sensor to create a distinct, visible image. All video cameras (and still cameras) need lenses in order to obtain a clear picture. Lenses come in a variety of focal lengths. The focal length of a lens, in combination with the size of the imager, will determine its field of view.

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Low Light (or low lux) Sensitivity

Low Light (or low lux) Sensitivity refers to a camera's performance under low lighting conditions. Although many camera distributors flash very low light "lux" numbers, these numbers often times have nothing to do with real world performance. Specifications offered by CCD manufacturers list the absolute lowest light level at which some pixels will be altered. However, a human being looking at that recorded video will never be able to distinguish anything under the lowest lighting conditions (near pitch black). (The latest Sony 1/3 " CCD chip sets have the best low light performance of any such other CCTV cameras on the market today).

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