Pentax SMC Takumar 135mm f3.5
The SMC Tak 135mm f3.5 is a great little telephoto. Solid, very well dampened. Tack sharp from f3.5 in the center. Almost as sharp in the corners. Mild vignetting at f3.5, gone by f5.6. No noticeable diffraction at f16. Contrast is slightly lower than the 200 f4 SMC Tak and this makes sense being a 135mm and designed for portraits. Bokeh is smooth with a smooth transition. Some normal color shift in the bokeh of high contrast transitions. Minor bokeh fringing in high- light transition areas.
100% crop. f5.6. (This is the corner)
50% crop. f3.5.
100% crop. f5.6 Center