Most video surveillance cameras are installed in one location permanently. For this case, fixed-focus lenses are the most cost-effective. If you want to be able to move your camera, variable focus lenses are adjustable, letting you change your field of view when you reposition the camera.
If you want to be able to move the camera remotely, you'll need a pan/tilt/zoom (PTZ) camera. They can cost 10 times as much as a standard fixed camera, though, so make sure you really need one before spending the money.
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