The Samyang 20mm f1.8 for Nikon is a super wide-angle manual focus lens designed for Full Frame or smaller sensor formats. The Nikon version provides aperture information to the camera. 13 elements in 10 optical groups including two aspherical and three extra-low dispersion elements provide a highly corrected image, enhanced with UMC Ultra Multi Coating to minimise flare and improve contrast. Minimum close focusing distance is just 20cm. Its sturdy aluminium alloy body has a wide, ribbed manual focus ring which is smooth and well-damped, and the lens is supplied with a detachable petal shaped lens hood.