Then you won't want to shim lens boards or film carriers with tape like I do. Litho tape or clear Scotch tape doesn't compress like some other tapes. Really, it does work, and it doesn't get out of alignment easily. As for optimum aperture, a quick check with your grain focuser will tell you more than theory or your physics class would have. Sharp fine grain can get a bit fuzzy in the center of the image when a fine lens is stopped down to f/8. In theory any lens can resolve only about 200 lp/mm at f/8.
Originally Posted by ChrisW