Mamiya-Sekor Zoom 75-150mm f/4.5

Mamiya-Sekor Zoom 75-150mm f/4.5 | S/N: Checked / Secure

Mamiya-Sekor Zoom 75-150mm f/4.5 Manual Focus Telephoto Zoom Lens - Good Condition | Rare Medium Format Telephoto Zoom Featuring Constant f/4.5 Aperture, Robust All-Metal Mechanics, and Legendary Mamiya 645 Bayonet Mount

Introductory Paragraph The Mamiya-Sekor Zoom 75-150mm f/4.5 is a beautifully over-engineered, professional manual focus medium format telephoto zoom lens built by Mamiya in Japan. Designed specifically for the iconic Mamiya 645 multi-format film system, it features a highly versatile focal range that bridges standard portrait compression with deep telephoto isolation, all while maintaining a constant f/4.5 maximum aperture across the entire zoom profile. Constructed with a heavy-duty all-metal barrel chassis, this highly scannable Mamiya lens renders images with spectacular micro-contrast, vibrant color fidelity, and minimal edge-to-edge optical aberration, offering a deeply satisfying, transparent workflow for analog studio portrait artists, landscape documentarians, and adapted digital mirrorless medium format cinematographers.

Key Features

• Constant f/4.5 maximum aperture tracking symmetry, ensuring completely predictable, steady light gathering capabilities and depth-of-field control throughout the entire zoom range.

• Versatile 75-150mm medium format focal zoom coverage layout, delivering a highly compressed field of view roughly equivalent to a 45-90mm lens on standard 35mm format.

• High-performance multi-layered optical glass element multi-coating, dramatically neutralizing internal structural ghosting and flare while boosting micro-contrast.

• Heavy-duty all-metal industrial barrel housing engineering design, guaranteeing exceptional mechanical field durability under rigorous, professional studio or travel schedules.

• Dual independent rotational manual focus and manual zoom ring layouts, providing precise, tactile mechanical dampening for smooth compositional tracking.

• Professional 9-blade circular manual aperture diaphragm network, shaping out-of-focus background details into an exceptionally smooth, painterly bokeh rendering.

• Native Mamiya 645 breech-lock bayonet mount geometry, locking with absolute mechanical rigidity onto vintage film bodies or modern digital medium format adapters.

Condition Report Good condition. Body: Standard light signs of professional use, showing typical minor superficial scuffs on the black anodized outer metal barrel and tiny finish rub lines along the knurled metal focus grip ridges. The rear mounting flanges are clean and seat firmly. Sensor/Optics: Lens elements are bright and clear. The internal optical glass path is completely free from internal fungus, heavy haze, optical separation, or deep glass scratches. Mechanics/Electronics: Fully operational. The dedicated manual focus ring turns evenly with a silky mechanical feel, the zoom ring rotates uniformly without catching or barrel creep, and the aperture selector clicks decisively into every stop with clean, dry, oil-free internal blades.

Specialist Note "The Mamiya-Sekor 75-150mm f/4.5 is a remarkable piece of vintage engineering because creating a high-performance zoom lens for the massive image circle of medium format film was incredibly difficult back then. Mamiya absolutely nailed it with this model—it is famously sharp right from wide open at f/4.5, offering a constant aperture so you don't lose light when zooming in on a subject. It renders textures with that signature, rich Mamiya medium format pop and micro-contrast. Whether you are locking it onto a classic M645 film body or adapting it onto a modern digital mirrorless system, it feels completely transparent, rewarding, and built to survive anything."

What's Included

• Mamiya-Sekor Zoom 75-150mm f/4.5 Telephoto Zoom Lens (S/N: Checked / Secure)

• Front Protective Clip-On Lens Cap

• Rear Mamiya 645 Mount Protective Cap
  

Technical Specifications

• Brand: Mamiya

• Model: Mamiya-Sekor Zoom 75-150mm f/4.5

• Lens Type: Telephoto Zoom Lens

• Lens Mount: Mamiya 645 Mount

• Focal Length: 75-150mm (Medium Format 6x4.5)

• Maximum Aperture: f/4.5 (Constant)

• Minimum Aperture: f/32

• Focus Type: Manual Focus Only

• Category: 2. Lenses ▸ Telephoto Zoom Lens

• Battery Type: None Required (Fully Mechanical)