Cosina just published this video with the info about a new Voigtlander 75mm f/1.8 FE lens with built-in BOKEH control ring.

If you rotate it you can create different kind of Bokeh effects:

Curiosity: At the beginning of the video Cosina introduced the new Zeiss lenses with whom they have a partnership. I suspect the OTUS lenses are produced by Cosina ;)

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Thanks Greg Painter for spotting this!