|16x20" print on Negra Portrene f5.6 ||
|Middle center showing much sharper image. (400dpi) Negra Portrene f5.6 32 seconds|
|Lower right corner zoom showing edge softness of image.(400dpi) Negra Portrene f5.6 32 seconds |
I bought a Schneider Comparon lens on the name alone and without any research. Testing showed it to be substantially better. Subsequent research however showed this was a low-end lens and what I wanted was a 6 element lens (Componon in Schneider-speak). Also Nikon and Rodenstock are good lenses but again with Rodenstock they make good and mediocre lenses. Testing also revealed that stopping the lens down showed marked improvements.This has the drawback of very long exposures. Even on Ilford MGIV RC paper at f22 exposures went to 360 minutes! Sharper images but one must be awfully patient.
|Right edge zoom Schneider Comparon f22 360 second exposure (400 dpi) Ilford MGIV RC|
|Right edge zoom Schneider Comparon f16 45 second 150 watt bulb (400dpi) Negra Portrene|