>From the archives, I found this from John Williams...
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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.
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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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