I'll bring up something that hasn't been brought up before, and that's
the location of the blades! How many elements in front and how many
elements behind it? I think that has more to do with the bokeh than the
number of blades..
My 50mmf1.8 has 6 blades, and my Tokina 90mm f2.5 has 8 blades. The
50mm definitely has better bokeh than the 90mm. So blades can't be it.
Also, I suspect that the number of elements has a lot to do with it as
well.. Internal reflections of image and such..
Albert
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