Here is a fun lens comparison that I did. All images were shot on Tri-x 400 at 800 and developed in Edwal FG-7 1:15 and 20C for 12 minutes. The three lenses shown here are a Canon 50mm f1.8 FD, a 50mm f1.5 Nokton LTM ASPH, and a 50mm f1.9 Promaster lens. Which lens shot which image?? Roll over the image with your mouse to see the file name and the lens name. The conditions are similar, overcast light or shade, but the most interesting aspect is really to look at how each lens renders a scene at a wide aperture.