This is a rare lens. Adaptamatics predate Adaptall lenses. The adaptamatic mounts are a bit finicky and more scarce than the lenses. I've discovered that my Eos M adapter doesn't allow infinity focus with this lens so I will be updating this page after I test with my or A7rii.. I have learned that this lens is sharp wide open and it handles flare well. There is some minor fringing in highlights but it is barely noticeable. I can't wait to take some 'important' shots with it. Bokeh fringing is well controlled.