The Leica Macro-Elmar M 90mm f/4 lens is the latest addition in the popular short telephoto lens range, and when combined with the dedicated Macro Adapter M (made specifically for this lens) has a reproduction ratio of 1:3. Weighing under one lb, and only 1.6" (41mm) when collapsed, the Macro-Elmar-M 90mm f/4 is first choice whenever you wish to limit your outfit to a minimum without forfeiting the maximum in image quality.
The Macro Adpater M (black) was specifically developed as an accessory for the 90mm f/4 Macro lens. It allows close focusing with this lens from 2.5" (0.77 m) (reproduction ratio 1:6.7) down to 1.6" (0.5 m) (reproduction ratio 1:3).
The Angle Viewfinder M (black) shows a large, round, upright, and un-reversed central section of the viewfinder image of approximately .3 inches. The freely rotatable 45° eyepiece makes it considerably easy to view the subject in all situations, especially where the photographer does not want to hold the camera exactly in front of the eye, e.g. in case of reproductions or for close-ups close to the ground.
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).