That's basically it. Both do 1:1 magnification. The 35mm needs to be about 6" away to get that, the 50 can be about 9.5"
I've never experience a downside to extra working distance, assuming everything else is equal; e.g. aperture.
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Doug
[I]Dodging and burning are steps to take care of mistakes God made when establishing tonal relationships. ~ Ansel Adams[/I]
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