The 5.8mm f/3.5 Circular Fisheye Lens for Nikon F from Lensbaby is a manual focus lens with a wide 5.8mm focal length that provides a fully circular image optimized for DX-format cameras. It is compatible with FX-format image sensors by producing a smaller image within the frame. The lens has an aperture range of f/3.5 to f/22 and captures a 185˚ angle of view. It features a close focusing range starting at 0.25" and going to infinity, all while providing expansive depth of field and image sharpness. This Lensbaby lens doesn't bend, so the fisheye image is always perfectly centered in the frame.