Samyang 15mm F3.5 fish eye manual focus lens. This lens is totally mechanical with manual focus it has 10 Element in 7Groups (1 Aspherical) and has a multi coat lens coating. It has a angle of view of 180˚(APS-C) and minimum focus distance of 0.3m(1.0ft) . This lens is available in Nikon and Canon EOS fit. In Canon EOS fit it has a stop down apperture.