I'm looking for a sharp, contrasty lens for my Fotoman 69. I'm looking for something around a 135 focal length. I have a Schneider 100/5.6 but I'm not particularly pleased with it. My other lens is a Nikkor 65/4 with which I'm very happy. All comments appreciated. I was also wondering what the difference was between the Rodenstock "N" and "S" lenses. I know this has been discussed before but I can't locate the thread. Thanks for all replies.