A varifocal Camera lens is an adjustable focal length, angle of view and level of zoom. This type of lens is often used in facilities like airports, hospitals, government offices and warehouses. With an adjustable lens, varifocal cameras allow you to adjust until you have the perfect field of view. Unlike a pan tilt zoom models, this adaptability is used for installation only. Once your field of view is set, it stays the same, until it is adjusted.
The key benefit to a varifocal camera is the flexibility this gives you during installation. They allow you to adjust the lens between the top and bottom limits of its view angle. This flexibility does come with an increase in cost.
