Yea, feels like the swirly bokeh of a photo taken using a lens with mechanical vignetting or sagittal astigmatism (colloquially Petzval, but field curvature is

Yea, feels like the swirly bokeh of a photo taken using a lens with mechanical vignetting or sagittal astigmatism (colloquially Petzval, but field curvature is both sagittal and tangential). (like https://commons.wikimedia.org/wiki/File:16042014_Bokeh.jpg https://commons.wikimedia.org/wiki/File:16042014_Bokeh.jpg, https://photo.stackexchange.com/questions/52126 https://photo.stackexchange.com/questions/52126)