2025 Biotar vs Fujinon Bokeh TTArtisan 75mm at aperture f/1.5 A7C05143, when shot wide open, the source of the signature swirly bokeh becomes clearly evident. Fujinon 50mm at aperture f/1.0 DSCF1865, not yet perfectly rounded bokeh balls and subtle onion rings TTArtisan 75mm at aperture f/2 A7C05143, the swirlyness is almost gone Fujinon 50mm at aperture f/1.3 DSCF1867, subtle onion rings TTArtisan 75mm at aperture f/2.8 A7C05271, almost perfect, however some smaller impurities in the bokeh balls Fujinon 50mm at aperture f/1.8 DSCF1870, subtle onion rings