I'm surprised that no one has mentioned Rodenstock Geronar, also sold as Caltar IIe, lenses. They were inexpensive new and really (usually) cheap used. Excellent lenses stopped down, available in at least three focal lengths; 150, 210, 300. They all allow for camera movements, which the Tominons will not.

Dan's info re: the MP-4 shutter is spot on, the aperture is in the lens, not the shutter.

JD