On monday I took my chance and had a nice camera walk in the sunshine of Heidelberg. To challenge myself I took a lens with me that I barely use. The Ernst Leitz Wetzlar Summar f=5cm 1:2 (Leica Summar 50mm f2).
The little Ernst Leitz Wetzlar Summar was built between 1932 and 1939 and is still yet a really sharp and superb lens. Its made out of six elements and has six aperture blades.
Even on modern 42 megapixel camera the lens is really usable. When its open at f2 its sharp in the middle with a slight vignetting and really soft corners. When you stop it down it becomes a really really sharp lens.
The bokeh is bubbly and swirly really similar to the Helios 44 lenses.