KIPON Leica L-M Mount Adapter with 6-bit Code for 50/75 This mount adapter allows you to attach Leica L (screw mount) lenses to Leica M-mount cameras or M-mount adapters. It is a rare type with a recess for writing 6-bit codes. It has already been painted, but you can change the code by referring to the code chart and repainting with white or black ink (paint markers or similar can be used). 6-bit code chart reference: https://at-leica.com/6bit/ When attached to a Leica M-mount camera, the 50/75mm bright frame will be displayed in the viewfinder (only on cameras that support the frame). Tested for attachment and shooting with a Leica M digital camera. It has been used infrequently and has no noticeable damage.