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A vari-focal lens is designed to meet the most challenging jobs by giving the installer the flexibility to adjust between different focal lengths using only one lens. When the situation calls for an odd focal length lens or you are not sure of the correct focal length required for the installation, using a vari-focal lens is the perfect choice. Benefits of using a vari-focal lens include: maximizing surveillance effects since any desired angle of view can be obtained; eliminating the need to carry several different focal length lenses to an installation job; and, easily satisfying customers after installation if the field of view requirements change since the system can be quickly adjusted by simply changing the focal length setting of the lens. Tamron offers a new line-up of megapixel compatible vari-focals designed to derive 100 percent performance from surveillance cameras equipped with megapixel count image sensors.