Larry, do you have both lenses? I am a little bit (and pleasently)
surprised that my Tokina is said to be sharper than the Zuiko. The Tokina
90mm is one of my favorite lenses.. I was always brainwashed that 3rd party
lenses are not as sharp as OEM's...
Albert.
----- Original Message -----
From: "Larry" <Halpert@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, January 07, 2002 1:20 AM
Subject: Re: [OM] 90mm macro question
> Those results corroborate my experience as well.
>
> Larry
>
> Olympus wrote:
>
> > >From the archives, I found this from John Williams...
> > ~~~~~~~~~~~~~~
> > At macro resolution (1:2)
> > Olympus 90mm f2 Tokina 90mm f2.5
> > l/mm /(contrast% 30 l/mm) l/mm(contrast)
> > f center corner f center corner
> > 2 40/(30) 36/(25)
> > 2.8 45/(47) 36/(30) 2.5 64/(55) 57/(49)
> > 4 45/(69) 36/(43) 4 72/(67) 64/(54)
> > 5.6 45/(68) 40/(45) 5.6 81/(68) 72/(59)
> > 8 51/(60) 40/(50) 8 81/(62) 72/(60)
> > 11 45/(54) 40/(42) 11 64/(62) 57/(55)
> > 16 40/(48) 36/(40) 16 51/(52) 40/(52)
> > 22 40/(33) 36/(27) 22 45/(45) 32/(42)
> > 32 - - 32 36/(31) 29/(24)
> >
> > At 1:4, the Tokina resolution numbers increase even more relative to the
> > Olympus.
> > ~~~~~~~~~~~~~~
> >
> > Now I have the Tokina 90mm f.25, and I was wondering if someone had
both,
> > and can really compare if these numbers are anywhere close?
> >
> > Also, a question I've been dying to ask, how do you calculate lines per
mm??
> > I mean, take a microscope to the film??
> >
> > Albert
> >
> > < This message was delivered via the Olympus Mailing List >
> > < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> > < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
>
> < This message was delivered via the Olympus Mailing List >
> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
>
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