Thanks for all your help. Guillermo's argument for a bigger-than-optimal pinhole strikes me as the most likely to produce better far-edge sharpness. though this would most likely sacrifice quality in the center. I wonder if it's worth it, or whether I should just go with what I have. As to my camera, I don't have a picture of it, but when I do, I will post it somewhere and let the list know. Thanks again, Simon
