which seem to be something of a theme with this lens. The most serious optical flaw I encountered with the Laowa 10mm f/2.8 is the bokeh, which takes the form of a bizarre-looking pentagon ...

The 7Artisan's 10mm f/2.8 II is said to be available ... An 11-bladed aperture should keep bokeh smooth, and the lens has 11 ...

Bokeh is a photography term that’s a bit difficult ... or “subject isolation”, achieving it optically requires a fast lens with an aperture below 2.8 or preferably lower.