On the other hand with the argument that bokeh is related to the number
of aperture blades I would presume that the basis of that is that the
more blades the better it approaches a perfect circle. I doubt that
there is a significant difference in the form of the aperture between
an F4 lens with 6 blades and a physically larger F2 lens with 9
blades. I think that Oly must have a standard tolerance of the aperture
deviation from a circle and adds more blades as the lens gets faster,
not to improve bokeh. I think H.K. Ling is probably right that it has
more to do with the design of the lens. Of course square or donut
shaped apertures are another thing entirely.
Winsor Crosby
Long Beach, California, USA
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