Good point about file size. I have worked a lot over the past several years with faily high resolution scans of 6X7cm and 6X9cm files, with file size in the 60-120 mp range. With this size file I have found it possible to do rather extensive perspective control, quite a bit more than the 1/3 width area Kirk mentions, not surprising perhaps since my file sizes are at least 4X more than what one would get with the best DSLR with file size of 20 mp or so.
My route is probably not a viable professional path because it involves scanning, but for high quality results, when one has the time, it works.
Sandy King
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