http://www.supercircuits.com/accessories/camera-lenses/varifocal-manual-iris-lenses - Look for security camera models that feature varifocal lens. This type of CCTV lens makes it easier to control the focus feature of the security camera, allowing you to view long and short exposures of video feed on your LCD monitor for better investigation. Varifocal lens feature better security options for those who have a wide range of area to cover.
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