The Leica M can be used with a multitude of lenses far beyond those available from the current portfolio. Frequently, photographers use lenses with a “vintage” signature to achieve particular effects that are difficult to reproduce, even with the most modern digital post-processing software. The Summaron wide-angle, now more than 50 years old, is a particularly popular and compact lens that has been recreated with an M-bayonet mount, 6-bit coding, and a slightly revised design.