alt Hacker NewsThat is from the normal (24mm) camera slightly stopped down (f/1.8), judging by the EXIF.
Odd bokeh was one of the risks of adding a mechanical aperture, and bokeh is very often weirdest at the first or second down from open.
I would hope that the telephoto lens does not show this so severely (because it has a fixed round aperture) but all mobile phone lenses in my experience have had a tendency towards a sort of concentric-ringed, quasi-soap-bubble bokeh; it's a common part of the challenge of really tiny optics (that you either like or dislike). (The iPhone X was really distinctive in this regard). So it's not too surprising to see the aperture do this on top of that.
As a general rule you don't see it in average images, but I guess sensors are now high-enough resolution that it's becoming more obvious, and the blades of a mechanical aperture might make it quite noticeable in some situations.
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> Odd bokeh was one of the risks of adding a mechanical aperture, and bokeh is very often weirdest at the first or second down from open.
Why? Where can I read/learn more about this?
An aside re: telephoto lens: Duo doesn't have one! It creates the effect of a 2x lens by enlarging the unmagnified image.
Soap bubble bokeh comes from overcorrected SA. Onion rings and related brightness anomalies/unevenness in bokeh are mostly the result of molded aspheric lenses. Stopping slightly down has not significantly impacted bokeh (apart from apodized lenses) since rounded aperture blades have been invented about fifty years ago.
Polygonal aperture openings are not the cause of soap-bubble bokeh, it's the cause of polygonal stopped-down bokeh.
Heavily ringed bokeh just comes from the optics.