This is an excellent copy of the rare Canon 28mm f2.8 m39 screw mount rangefinder lens. Lens is in great shape, and perfect for use on a Canon 7 or 7s, Leica, or other mirrorless. Had always been kept in its case attached to a camera - so no scratches, fungus, hazing, etc. Comes with its original Canon front lens cap, but no rear cap unfortunately. Can include an m39 to M-mount adapter for a little extra if you're interested. Let me know if you have any questions. Asking $600.