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[OM] Re: Apertures, where is f22 ?

Subject: [OM] Re: Apertures, where is f22 ?
From: Der Eiserne Reiter <ferider@xxxxxxxxx>
Date: Tue, 7 Jun 2005 13:59:06 -0700 (PDT)
Thanks, Moose.

--- Moose <olymoose@xxxxxxxxxxxxxxx> 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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FeRider (R.)


                
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