This has become perhaps my favorite 50mm lens. It has bokeh with a vengeance, despite its rather modest aperture. Leotax was the name given to cameras made by a small Japanese company, which was founded in 1938 and went on to make a number of different types, the most familiar being 35mm rangefinder cameras in the style of Leica. This lens was one of a number of standard lenses in Leica thread mount (M39). It has a bigger brother, the Leotax Simlar 5 cm f1.5, which is quite rare and quite expensive. An alternative to the Leonon was the 50mm f2 Topcor S. The Leonon is quite sharp, and has a very characteristic bokeh, which I think is well evidenced by the photos here.
