Poppies -- NEX-5N & Carl Zeiss Jena Tessar 50mm f2.8. Click for larger.
When I got the Carl Zeiss Jena Tessar 50mm f2.8, the focusing was stiff and coarse, but I have got it re-lubed and cleaned and it now works beautifully. Very smooth focusing and the lens itself is very well built. Like all Tessar lenses, this one is very small, though not as small as the 50mm f3.5 Tessar. I very much like the bokeh. Even stopped down, the bokeh still looks very nice, due to its circular aperture.