Well, I have both extremes. My Opemus enlarger came with a lens with a
square aperture! I have a Carl Zeiss Jena 50/2.8 Tessar with a 14 blade
aperture. I'd test the bokeh, but I don't really want to spend a lot of
time messing around with a very old Practiflex. According to the Camera
mounts & registers table, it has a 40X1 thread, not an M42, and the
register distance is slightly shorter than an OM, so I doubt there is
any way to try it on an Oly either.
Moose
Winsor Crosby wrote:
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.
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