> Hmm. Doesn't it go the other way? 50/135=.37 That's 1/3 magnification
> not 2.7x. If I put a 50mm reversed on a 50mm, I get 1:1 magnification. If
> I put the 50mm on a 100mm I get a 1:2 magnification. A 50 on a 200 would
> give you 1:4 magnification. You will only get greater than life size by
> reversing a longer focal length on a shorter focal length. For example, a
> 50mm reversed on a 35mm is 50/35=1.4x magnification. A 200mm reversed on a
> 50mm will give you 4x magnification (and serious vigneting too).
>
> ...when in doubt, reference John Shaw's books...
John Shaw's book says magnification is prime lens/reversed lens.
135/50=2.something.
Foxy
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