Mamiya's medium format telephoto — 180mm f/4.5 for the RB/RZ67 system.
The Mamiya Sekor 180mm f/4.5 is a medium format telephoto prime from Mamiya's Sekor lens range. The Sekor designation was used across multiple Mamiya medium format systems. Confirm which Mamiya system (RB67, M645, Universal, etc.) this lens mounts on before purchase. Mamiya proprietary mount.
f/4.5 maximum aperture. 180mm focal length (medium format). Manual focus. Mamiya Sekor optical formula. Mamiya proprietary mount — system-specific.
A 180mm focal length on medium format provides a moderate telephoto perspective — approximately equivalent to 100mm on 35mm full-frame in terms of subject magnification relative to medium format 6×6 format. The Mamiya Sekor name spans multiple system generations; the specific mount variant determines compatibility.
On the used market the Mamiya Sekor 180mm f/4.5 is a medium format telephoto prime. Condition checks: front element for haze or marks, aperture blade smoothness, focus ring operation. CONFIRM MAMIYA SYSTEM MOUNT before purchase.