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Varifocal Lens Varifocal lenses offer more flexibility, allowing the field of view to be adjusted manually.
These lenses are popular because the user is able to get the view required rather than be limited by the constraints of a fixed lens.
The 4-9mm varifocal lens allows the user to vary the focal depth and angle of view that the camera achieves (literally allowing you to zoom in and out). The more you zoom in, the narrower the field of view is so for instance at the 4mm setting the camera will give an angle of view of 68 degrees. If set at the 9mm setting the camera will give an angle of view of 23 degrees.
Connect your cameras to a DVR to record and view a high quality digital image.