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Having noticed that different lenses I have produced noticeably different
results in terms of out of focus areas (bokeh) I wondered why. Then I
noticed that my lenses did not all have the same number of aperture blades
and I wondered why that would be and also noticed that there seemed to be
a correlation between what I considered pleasing out of focus rendition
and the number of aperture blades a lens had. It seemed to be that the
more blades a lens had the more I liked it's bokeh.
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it is an issue, but those lenses with more blades have better bokeh
wide open too, and wide open, the diaphragm design is totally irrelevant.
I think an aperture with more blades matters some, but also I think
companies are more likely to put a diaphragm with more blades on
a lens that was designed to have better bokeh.
Lastly, Nikon lenses, without question, have worse bokeh than Olympus
lenses, yet the nikon diaphragms usually have more blades.
Joseph
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