But, I wanted faster, sharper, manual. From my collection of Leica M lenses, the venerable “quintessential rangefinder Ernst Leitz Summicron 50 mm f2.0 was a perfect match. It conveniently collapses for unobtrusive transport–although anything with a Leica logo is hardly unobtrusive. I’m using a Fotodiox Leica M to Sony E Adaptor. Of course, the images are stunning.