Mamiya's fast RZ67 portrait lens — the electronic leaf-shutter Sekor Z 110mm f/2.8 W for 6x7.
The Mamiya Sekor Z 110mm f/2.8 W is a fast short-telephoto lens for the Mamiya RZ67 medium-format system, introduced with the RZ67 in 1982. It is the fastest lens in the standard RZ67 line and is widely regarded as the system's premier portrait optic. The W marks it as part of the wide-to-normal working-lens group.
This is a manual-focus lens native to the Mamiya RZ67 bayonet mount, with a focal length of 110mm and a maximum aperture of f/2.8. It contains an electronically timed leaf shutter controlled by the RZ67 body, with the aperture set on the barrel and focusing by the camera bellows. The design covers the full 6x7 image circle.
At 110mm on 6x7 the perspective corresponds to roughly a 54mm lens on 35mm, and the f/2.8 aperture yields shallow depth of field on the large frame with smooth background rendering. It is a favourite for studio and location portraiture, prized for the way it isolates a subject. Detail sharpens strongly on stopping down, and the electronic leaf shutter allows flash sync at all speeds.
The Z 110mm f/2.8 W is one of the most sought-after RZ67 lenses, so clean copies appear regularly but hold their value. Because its leaf shutter is electronic, confirm correct firing at all speeds on a working body and watch for erratic timing. Inspect the glass for haze and fungus, confirm the aperture is dry, and verify the bayonet and electrical shutter coupling before buying.