This recent thread:
http://www.largeformatphotography.info/lfforum/topic/498879.html
is interesting to me because like Mr. Butler, I too am interested in a lens in the 75mm category for backpacking with my 4x5.
One of the things I notice about these lenses is that modern lenses seem to have bigger apertures. Almost all of them are f/5.6 or better. My question is, why is this? What does the larger aperture bring to the party? I'm guessing that it helps with focusing. But I've never used a really short lens before, so it's only a guess.
What do you photographers who use really short lenses think about the importance of a big aperture in a short lens?
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