The field of view (FOV) is the height and width of the picture size produced by a lens. FOV can be adjusted to your application using a different lens. There are two basic types of camera lenses: fixed focal (or monofocal) and varifocal (or zoom). FOV of a fixed focal lens can not be adjusted. FOV of a varifocal lens can be adjusted. Varifocal lenses are usually more expensive. The lense chart below illustrates the FOV of various lenses.