Produced between 1979-1993 and built in Canada, the Elmarit 28mm f2.8 was the third version of the 28mm f2.8 for the M bayonet. ( The current 28mm f2.8 is an aspherical lens which is much more expensive)The lens is super light and ideal for street photography. The Elmarit is super sharp more so than the Summicron version.