I am trying to photograph a curio cabinet full of junk. The cabinet is very shallow, only an inch deep, but it is in a narrow hallway. Because I am so close, I am using my 210mm Apo-Symmar. The bellows are drawn out, but not to 1:1. The lens is about 18 inches from the cabinet, so I have stopped down to f/22 to gain as much depth of field as I can with out diffraction. Where I am having problems is that the center and corners are sharp, but the middle areas are definitely not. I figure this is just a limit of this lens design, so I thought I might try my 210mm Componon-S instead to see if it has a flatter field, but I wanted community input before wasting more verynexpensive 8x10 color film.