Rokinon HD8M-N 8mm f/3.5 HD Fisheye Lens with Auto Aperture Chip and Removable Hood for Nikon DSLR 8-8mm, Fixed-Non-Zoom Lens Manual focus; Aperture range of F3.5-23 11 Elements in 7 groups (1 spherical lens); minimum focusing distance of 1-Feet (12-Inch) Features built-in auto aperture and auto exposure chip for auto metering with your camera (only available for Nikon mount) Ultra-wide 167 diagonal field-of-view for APS-C size image formats will produce a rounded image that doesn't cover the entire frame when used with compatible full frame digital cameras or 35mm film cameras Features improved HD optics for the sharper images Lens not zoomable