So I went out and bought an older Rodenstock Apo Ronar 360mm in Copal 3 for my 8x10.
Problem is that on the edges, say 5 to 6 inches from center, wide open the image can't be focused and is always fuzzy (to varying degrees, but never sharp). This is when looking at, say, a wall, a tree, or other close but fairly flat surface. The center can be focused properly and is sharp. There are no marks or defects on the lens that I can see, the elements are srcewed in properly, the lensboard is new and not warped etc....
So why in the world is this lens sharp in the center and not on the edges?
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