This lens has a manual focus ring with and interlocking follow focus gear to allow to be used in a cinema follow focus system.
This lens is for shooting video with DSLR (VDSJR) cameras.
To use follow focus, the AF/M focus switch is placed in the M (Manual Focus) position before shooting.
At the time of the normal photography, you can use autofocus.
The Tokina AT-X 107 DX NH V is fish-eye lens that gives the digital photographer an approximate 180° field of view with dramatic curvature of field of "fish-eye" effect. Full corner to corner image can be achieved on an FX camera between approx. 14.5-17mm depending on the camera model, at 10-14mm there is a semi-circular view.
The hood has been removed from this lens for a wider image area and more coverage for full-frame sensor cameras. In Cine/Video use it demonstrates its preeminent power.