The published circle for the 450 C is 486 mm at f/22 at infinity. That's huge; and most 8x10 shooters tend to use even smaller stops providing a much bigger circle still. And don't throw in a diffraction argument. Even a 30X40 print is only about a 4X enlargement from 8x10 film; so the effect of diffraction would be almost undetectable until clear down to f/64 or so, and even then basic depth of field management is a far bigger concern.
The rated image circle for the 450 CMW is about the same as for the 360A, around 504mm, so only slightly bigger than the 450 at f/22. But since the
C (compact) design is so thin, there's little risk of mechanical vignetting with strong tilts or swings, so by the time you're down to f/45, the effective image circle is actually bigger than most plasmats of the same focal length. Gosh, this is one of my most often used view lenses, and I know its character darn well.
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