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Re: [OM] diffraction, aperatures, f-stops, extensions

Subject: Re: [OM] diffraction, aperatures, f-stops, extensions
From: "C.H.Ling" <chling@xxxxxxxxxxxx>
Date: Fri, 8 Mar 2002 21:52:41 +0800
It was 20/2.

C.H.Ling

----- Original Message ----- 
From: "M. Lloyd" <royer007@xxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, March 08, 2002 8:30 PM
Subject: Re: [OM] diffraction, aperatures, f-stops, extensions


> But there were 2 20mm lenses made, which one was it
> the 20/2 or 20/3.5?
> 
> Mark Lloyd
> 
> --- "C.H.Ling" <chling@xxxxxxxxxxxx> wrote:
> > I have no experience on the Zuiko 20mm macro, but I
> > have seen a macro
> > book, the writer uses a lot of different gears,
> > ranging from Leica to
> > Nikon to Olympus. He said the Zuiko 20mm's
> > diffraction problem was
> > quite high which limited the use of smaller
> > apertures.
> > 
> > C.H.Ling
> > 
> > "Dean C. Hansen" wrote:
> > > 
> > 
> > >     I have a lot to learn about optics--and the
> > ways of this 20mm macro
> > > lens.  Anyone have any suggestions for using this
> > guy?
> > > Many thanks,
> > > Dean
> > 
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> > List >
> > < For questions,
> > mailto:owner-olympus@xxxxxxxxxxxxxxx >
> > < Web Page:
> > http://Zuiko.sls.bc.ca/swright/olympuslist.html >
> > 
> 
> 
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