More than Swirly Bokeh: Biotar 58mm f2 lenses on APS-C camera

When German and Russian Biotar type 58mm lenses are used on a Sony a6100 camera with an APS-C sensor, a crop-factor of 1.5 applies. That makes the field of view … Continue reading More than Swirly Bokeh: Biotar 58mm f2 lenses on APS-C camera