Thanks for your comments so far. I am learning more about the importance of flange distance with fixed mounts, something my 4x5 never insisted upon. Anyway, via a test roll, it appears that acceptable sharpness arrives at f32; workable, but not convenient. The DoF charts along with using HF are things I'm familiar with, but I'd like to be a little closer to the ball park. At this point, I think the solution is a different lens as opposed to a new adapter for the camera. (easier to sell a lens than an adapter) I'll try to post again when things are working, or I hit another dead end. Thanks again!