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Varifocal Lense


Surveillance Education Category:
Glossary
Author: Tyler Norris

This type of lens has the capability of varying its focal length in order to zoom in on images.  An auto iris feature is required in order to achieve this.  Variofocal lenses are contrasted with fixed focal lenses, which are less expensive and often allows more light to pass through them at their set length, enabling better detection in low light circumstances.



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