Rokinon HD8M-S 8mm f/3.5 HD Fisheye Lens with Removeable Hood for Sony Alpha DSLR 8-8mm, Fixed-Non-Zoom Lens Manual focus; Aperture range of F3.5-24 12 Elements in 7 groups (1 spherical lens) Minimum focusing distance of 1-Feet (12-Inch) 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