Der Eiserne Reiter wrote:
>Winsor,
>
>this is true for some lenses, but not for others. For example,
>the 35/2 peaks at f11 and f16, in Gary's test. Also, I am wondering
>if it depends on the shape of the aperture, nr. of blades, etc.
>The other day, on *bay, I saw the picture of a Zeiss lens
>with a triangular aperture and was wondering what this did to
>the picture.
>
Where the aperture is located in comnplex lens designs affects what
absolute physical size it is and thus where diffraction becomes a problem.
Aperture shape could certainly have an effect, although what it might
be, I don't know. Shape does have a big effect on bokeh/OOF images
<http://www.darkroom.com/MiscDocs/bokeh.pdf>.
Moose
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