Leica Lens on Olympus Pen F(T)
According to the information included with a Praktica-mount adapter for Pen F, there is a Leica Mount Adapter (Mount Adapter L; flangeback 36.3m/m, screw) which "can be used only in short-range photography". With a 50mm Leica lens the range is from about 1 ft. 2 in. to about 1 ft. 6 in. With a 135mm Leica lens the range is from about 3 ft. 7 in. to about 8ft. 9 in. A little table also includes ranges for 35mm and 85mm lenses.