Professional Range Lenses
The first thing that needs to be established when choosing a CCTV system is what needs to be seen. This will then help you determine what size and type of lens will be required.
MANUAL IRIS: Suitable for internal applications where ambient light levels remain constant.
AUTO IRIS: For external use, or internal use where the ambient light levels vary.
ZOOM: Usually used with pan and tilt units, these lenses vary the focal length and therefore the image size.
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