Speculating on aperture shape ...
Perhaps it gives different aperture values on differing areas of the film.
Depending on the size & location of the gap?
Secondly. Same subject from a different viewpoint.
The only irregular apertures I can remember seeing are either on older cameras
(
usually pre-WW2 ) or cheap consumer grade cameras
David
Moose wrote:
> 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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