I had the Mamiya-Sekor C 45/2.8 N, and it was a very nice lens. I\'ve read comments that it\'s not as good as the C 35/3.5N and C 55/2.8N, but I woiuld dispute that, they\'re all good lenses. I sold the 45, because the 35 and 55 provide the coverage that I need. Here\'s some links I use when I want info on the Mamiya M645 lineup:
