| http://www.w3.org/ns/prov#value | - This is great for use where there is no need to mess with changing the focal length regularly such as monitoring a parking lot, an entrance or exit, and other uses where zooming in on a subject or object is really not required and the camera will not be moved around a lot.Varifocal lenses on the other hand, can move in and out changing the size of their focal length.
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