The Leica 75mm f/ 2.0 APO Summicron M Aspherical lens is a fast high-performance lens that is also extremely compact. With its more natural perspective compared to a 90mm focal length, it is ideally suited for many applications including reportage and portraits - particularly in smaller rooms. Its small dimensions result in not only outstanding handling but also a Leica M viewfinder image that is almost completely free of shadowing, thus allowing totally undisturbed viewing of the subject. This lens has been updated with the "6-bit" coding, which allows the digital M camera to read this information optically and to identify which lens is being used.
The camera can then (optionally) apply a "final stage" software based vignetting correction (for RAW images the lens used is simply recorded, no change is made).