You're looking at the wrong one, Dan. They have another in Copal 0 with a 120mm circle
at f/8; and probably that circle gets significantly larger at f/16 or f/22. You almost have to
use these at mid stops like on a 4x5 anyway, just because of film plane issues with most
rollfilm holders. My own Horseman holders seem dead on, but still 6x9 focus is a lot more
finicky than 4x5, and the shorter the FL, the less forgiveness there is. The widest lens I
personally use for 6x9 is a 105 Nikkor M; but there are only one or two trips a year I actually need roll film.
I use the 47mm Super Angulon F/5.6 and Grandagon 35mm. The 35mm Grandagon is almost too wide. (I use each with 6x12cm as well.)
Drew, thanks for the correction. f/5.6, not f/4. Oh, my, its expensive.
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