Strengths: Useful as ~90mm (135 format) prime or short portrait lens. Sharp as any MF system lens available. K/L series had great coatings & QC; few duds. Beautiful rendition of light and subjects digital can’t match. Usually available in great condition at reasonable cost.

Heavy! Slow aperture at f/4.5 but very usable. Not recommended for adaption to other camera systems.

The classic RB portrait lens. Focuses very close.

Beware of "bellows factor" light loss with very close focus.

Much better than early "pre-C" 180's, though not remarkably better than a recent 180/4.5 C. A 180 should be your first portait lens.

Customer Service

Mamiya is always attentive.

Similar Products Used:

127, 140 and 150 lenses are good portrait choices with 645 back.
150, 180, 210 and 250 are good for 6X7 back.