I recently bought a used 50mm Sekor C lens and had been a little concerned as to what the quality of my images would be like seeing as there had been a few posts about the sharpness of this lens.

Well I got my first batch of slides back today after using this lens and can only say how totally knocked out I am by the quality and the sharpness of the images; absolutely superb lens... well done Mamiya. I'm so glad I went for the RB67 as opposed to going digital.