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The Mamiya-Sekor SF C 150mm f/4 is a legendary special-application telephoto lens designed for the Mamiya RB67 medium format system. Highly prized by portrait and wedding photographers, this lens features controllable soft focus via designed-in spherical aberration. By using the included diffusion discs at apertures from f/4 to f/6.3, you can achieve a signature "glow" while maintaining a sharp underlying core. When stopped down to f/8 or smaller, the lens bypasses the soft-focus effect to deliver exceptionally sharp, traditional telephoto images.
This lens is in excellent vintage condition. The optics are clear and brilliant with no fungus, haze, or separation. Minimal internal dust is present, which is typical for a lens of this age and does not affect image quality. The mechanical shutter is fully operational, with speeds sounding accurate to the ear. The aperture and focus rings move smoothly without resistance. The barrel shows light cosmetic wear consistent with professional use.