If the problem is just with the "deep" end of the lens board, perhaps you could take the lens board and lens to a machine shop to have them custom-build a new one with a sharper curve in that end of the board. OTOH, that might cost as much as or more than a new lens. I'm not sure what high-quality lenses would fit. Based on the sizes of my own lenses, the Russian-made Vega-11U would probably fit, but it's not quite as sharp as the Nikon EL-Nikkor f/2.8 (at least, my Vega isn't quite as sharp as my Nikon).
Originally Posted by lilserenity