Originally Posted by Henry Yorke
Ath - my paper size is 8x10, printing a 6x6 negative. I've read in a few places that stopping the aperture on the lens right down wasn't a good idea - but I'll experiment with the one I've got.
Stopping down a lens beyond f/11 or so introduces diffraction. This gives a slight unsharpness which is completely invisible at the magnification you are using. Stop down and be happy.