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Re: [OM] 90mm macro question

Subject: Re: [OM] 90mm macro question
From: Larry <Halpert@xxxxxxxxxxxxx>
Date: Mon, 07 Jan 2002 04:20:14 -0500
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
>
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