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Re: [OM] How many aperture blades on 50/2 macro?

Subject: Re: [OM] How many aperture blades on 50/2 macro?
From: *- DORIS FANG -* <sfsttj@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 8 Feb 2000 21:22:11 -0500 (EST)

On Tue, 8 Feb 2000, John Pendley wrote:

> I am curious on this issue, also.  I have just finished counting the blades 
> in a
> Leitz Elmar 90/4.  There are so many, I may have lost count, but I think it 
> has
> 15 blades.  As you close the iris down, the aperture remains a virtual circle.
> This effect is not duplicated by any 6 or 8 blade diaphragm.  Does it have an
> effect on flare, ghosting, etc. or only in the *shape* of such artifacts?

  It gives the kind of bokeh most people favor. Ghosting is a kind of
extreme flare, and the shape of ghosts depends a lot on the angle of the 
light source in relation to the lens axis. One gets everything from
circles to what looks like radiused cones.

                          *= Doris Fang =*




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