The Sigma 65mm F2 DG DN is a compact short-telephoto prime for E- and L-mount bodies. It has 12 elements in 9 groups, including SLD and aspherical glass. The focus unit is driven by a stepping motor. The minimum focus distance is 55cm (21.7") and the maximum magnification is 0.15x. The lens has a manual aperture ring as well as a 'fly-by-wire' manual focus ring. The all-metal chassis is sealed against dust and moisture.