Thank you, All, for your sage advise regarding small-format lenses in a large-format application! We chose to take your advice, and stick with large-format lenses for our imaging of the oldest known New Testament manuscript that we are working on. We have purchased some lenses, (An Aero-Ektar (f2.5), some Wallensaks (f4.5-5.6) and Tasser-types (f5.6)in the 150mm-210mm range). We have also consulted the Astrophotography community where their systems routinely yield extremely high resolving powers. They have emphasized the importance of matching the curvature of the focal plane to the lens. Does anyone know where a raytrace of an individual lens can be performed? We can then use this information for custom-making of a curved focal plane for our camera (We are modifying an old Repromaster Copy camera). Thanks Again for all your help! Fr. G.