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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