Beautiful pictures from this lens. It is certainly getting more use than I ever gave it, just too many lenses and this one was too nice to just sit.
This one has the nice round aperture, and is beautifully coated. Some internal haze came right off, left the coatings intact.
Note that this is the 5cm f2 Summitar. The name sounds much like the Summarit, the 5cm f1.5 lens. I found the character similar, the Summitar sharper at the center wide-open than the Summarit was at F2. Both have swirly Bokeh.