Sigma 45mm F2.8 DG DN Contemporary lens is a compact, standard prime for full-frame Sony, Leica and Panasonic mirrorless cameras.
The lens is just 46mm (1.8″) long and weighs 215g (7.6oz), but still has a metal lens barrel and weather-sealing. It contains eight elements, a seven-blade aperture and 24cm (9.4″) minimum focus distance. The 45mm has an aperture ring, as well.
The Sigma 45mm F2.8 DG DN Lens will start shipping soon, and pricing is expected to be announced shortly. It is expected to be around $500.