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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