'The Voigtlander 35mm f/2 APO has straight aperture blades and 12-point strokes. it's capable of nice sunstars starting at f/10 and best at f/11, f/13 and f/14.
This lens is equipped with Cosina's new aperture diaphragm, capable of rendering "completely round specular highlights" at f/2, f/2.8, f/5.6 and f/16.'