I use an APO componon HM 45mm f/4 to print large prints of 35mm...mostly 16x20 and 20x24. I generally try to stop down to f/5.6 if I can, but in my experience it has been wonderfully sharp straight to the corners using a glass carrier. I used to have an 105mm APO EL-Nikkor, and I sold it because I just could not see a difference in the prints between it and the schneider, and the schneider was so much easier to work with given the focal length and aperture (and lighted aperture index, stop-down lever etc).