So... this Takumar lens is the first ever made fast retrofocal 35mm SLR lens. Despite it's age, its performance is interesting. It has quite interesting bokeh - swirly at f/2.3, but much smoother at f/3.2-f/4. Border sharpness on APS-C camera is very good at f/8, best at f/11 (lens doesn't allow set f/9). At lower aperture values, there is a lot of glows (reflections) and possibly spherical aberration. However, all forms of chromatic aberration are zero at all aperture values.
First two pictures with green branches are taken at f/2.3-2.8, close-up samples at f/3.2-f/4, White flower at (about) f/7. Distant trees always at f/11.
I forgot to mention, that I used small extension ring for the close-up photos. The lens allows focusing to 45cm only. _________________ (almost) complete list of Helios lenses
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