If a 56 inch lens covers the format you need a 10 inch aperture to get f5.6, and slightly bigger lens elements. The picture would be less sharp if a set of meniscus lenses are used.
Very few photographers need f5.6. If Avedon used f16 on 8x10" what would be the benefit of such a large and bright lens?
And are you looking in to a sharp lens or soft or very soft?
I just got my 138mm tubus mounted, it contains a 450mm f3.6 balopticon lens and is heavy and cumbersome.
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