Leica Camera AG, Solms will be giving the lenses of the Leica rangefinder system a new code on the bayonet ring in future to enable the planned digital Leica M camera to recognize the lens type. The information on the lens that is being used helps the camera to optimize image quality.

All lenses leaving the factory from July 1st, 2006 onwards will have the new coding, although they can still be fully used with the current analog cameras LEICA MP and LEICA M7 as well as classic models built after 1954. Lenses in the current range as well as many earlier models can be retrofitted at the cost of the owner to benefit from the image optimization in the camera. The lenses are compatible with the planned digital M camera even without retrofitting, except that the additional features cannot be used.

You can read the full press release here: