Create the circular distorion from an anamorphic lense I try to recreate the circular distortion of an anamorpic lense
like here

 



I know about this way to strech the bokeh vertically.
Bokeh - From Horizontal to Vertical

and i have seen this one were a fisheye lense is used.
https://code.blender.org/2014/08/anamorphic-bokeh/

and im using a lens distortion node in the compositor to achive additional realism.
Is there a way to create this circular distortion in the bokeh without a fisheye camera?
You can probably use radial blur to simulate the effect of lens aberration in post-processing.

But the effect is also surprisingly easy to achieve in Cycles with the camera. Just add a black, circular aperture object in front of the camera:





Here is the setup from the camera's perspective. The more closed off the circle is, the heavier the vignetting:


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