Today I received two parcel from Germany, one customer sent lenses for his Byron, one is a Rodenstock Grandagon-N 4.5/75mm in #0 shutter, I knew that Byron can handle 90mm lens quite safely, but never tried a 75, because I did not own one.
But it did! Byron handles it quite well! by inspecting on ground glass I saw that image is just at the edge of the camera bed when focus to infinity.
Will make some field test these days.