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Re: [OM] ...blades & bokeh.....

Subject: Re: [OM] ...blades & bokeh.....
From: "Giles" <cnocbui@xxxxxxxxx>
Date: Tue, 24 Aug 1999 00:50:58 +0000
This topic came up a while ago in connection with a discussion about bokeh so 
the 
list collated the information on how many blades each zuiko has.  if you follow 
this 
link you will find the information.

http://www.datasync.com/~farrar/zuiko.html

This is mostly just my speculation so take it with a pinch of salt.

I believe the number of aperture blades is a contributing factor in the quality 
of 
bokeh a lens has.  Out - of focus highlights often can be seen to have an 
angularity 
which corresponds to the shape of the aperture.  I believe this also means that 
all 
out of focus areas, not just the highlights, are shaped by the aperture, it's 
just 
more obvious with highlights.

So, the more aperture blades a lens has the more nearly circular it is and so 
the 
less angular shaped will be the out of focus areas.  IMO anyway.

Some f2 lenses have 6 blades, some have 8 and some have 9, like the 90mm f2 
macro.

Giles


claire wrote:

> Is it  true that these more blades contribute to the superlative performance
> of these lenses ? How ?
> Also heard that more blades equal better 'bokeh' . How does this work ?
> Does anyone have a 50/f2 Mac ? How many blades does it have ?
> Do the entire family of Zuik f2's all have 8 blades ?
> 

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