I have a 1968 M4 and vintage M lenses: 1956 Summaron 3,5cm/f2,8; 1958 Summicron V2 Rigid Dual-Range 5cm/f2; 1954 Elmar 9cm/f4 collapsible; 1961 Elmar 13,5cm/f4. They are all wonderful lenses with great character, receding very gracefully into a soft bokeh; whereas, the modern aspherical lenses...