Although it is my general understanding from reading other posts that a lens wit h an image circle of 210 is the minimum necessary to cover 5x7, I would apprecia te guidance regarding how much covering power one needs to use a significant amo unt of movement -- for example, the kind of movement possible on a Canham 5x7 (t he camera that I have been eyeing). The lens descriptions in the B&H catalog, f or example, make recomendations regarding the maximum format for each listed len s -- but it is hard to get an idea of whether the lenses listed for 5x7 are at t he minimum range for this format or are really useful if movements are used. I am considering moving up to large format to have negatives that I can contact pr int using non-silver methods. My subjects are architecture, statuary and landsc ape. I am considering three focal lengths: 150 mm (because it appears to best approximate the 50 mm lens that I use in 6x6); 210 mm (as a normal lens); and 45 0 mm (for details). A 4x5 negative seems too small -- if I'm going to bother wi th sheet film, it seems to make sense to have a negative that I can crop if nece ssary and still contact print. I would also appreciate any advice regarding my proposed choice of format.
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