The tokina 11 20mm f28 at x pro dx lens is an ultra wide angle zoom designed for stills on a nikon dslr with aps c size sensor ultra wide angle lenses allow you to exaggerate perspectives get closer to a subject and allow you to bring viewers into the frame suitable for a wide variety of applications from photojournalism to landscapes interior and architecture work the lens also features a bright constant f28 aperture making viewing and autofocus possible in low light situations