We mounted a Juplen 135mm f/2.8 Preset M42 Screw Mount on a Nikon Z7 and tested its bokeh quality.

We mounted a vintage Tanaka Kogaku Japan Tanar H.C. 1:2 f=5cm Lens from late 1950s on a modern mirrorless camera, and tested it for bubble bokeh, swirly bokeh, flare quality, sharpness, etc. and shared the results.