Minolta/Sony Smooth Trans-Focus

[usayit]

Apparently this lens has been around for a little while but I'm just now reading about it. Pretty darn creative, innovative and exotic... I like! Wish they had something similar in Canon EF mount or M-mount.

http://www.dyxum.com/columns/articles/lenses/SAL-135F28/Sony-AF-135-STF-SAL-135F28_review.asp

Anyone have a clue as to why two aperture diaphragms are needed to produce such nice bokeh? Kinda says in the article but it isn't too clear. I know many Leica lenses use a large number of aperture blades in order to create pleasing bokeh.