Mamiya 645 150mm f/4 Sekor C Lens
The Mamiya 150mm f/4 is a 150mm f/4 lens designed for Mamiya 645 mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Mamiya 645 150mm f/4 Sekor C Lens
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Lens Overview — Mamiya 150mm f/4
Key Features — Mamiya 150mm f/4
150mm Telephoto Prime: Fixed focal length provides a consistent telephoto perspective well-suited to portraiture, studio work, and subject isolation.
Medium Format Coverage: Designed to cover the 645 format's larger image circle, delivering the characteristic tonal richness and detail of medium format optics.
f/4 Maximum Aperture: Offers a practical balance between light gathering and lens size for a medium format telephoto, with enough depth-of-field control for portrait-style background separation.
Manual Focus Design: Full manual focus control is standard for this era of medium format lenses, placing precise focus decisions directly with the photographer.
Native Mamiya 645 Mount: Integrates directly with any Mamiya 645 body — film or digital — without adapters or compatibility compromises.
67mm Filter Thread: Common filter diameter makes it straightforward to use standard circular filters without sourcing hard-to-find adapters or step rings.
Lens Specifications — Mamiya 150mm f/4
| Spec | Detail |
|---|---|
| Use Cases | Portrait, Studio |
| Lens Type | Prime |
| Format | Medium Format |
| Zoom/Prime | Prime |
| Focal Length | 150mm |
| Maximum Aperture | f/4 |
| Camera System | Medium Format |
| Lens Mount | Mamiya 645 |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 67mm |
Description — Mamiya 150mm f/4
The Mamiya 645 150mm f/4 Sekor C is a prime telephoto lens designed exclusively for the Mamiya 645 medium format camera system. With a fixed 150mm focal length, it delivers consistent telephoto framing that works well for portrait and studio applications where controlled working distance is important. The lens operates at a maximum aperture of f/4, providing a solid light-gathering baseline for a medium format telephoto.
Focusing is entirely manual, giving the photographer direct, tactile control over focus placement — a straightforward workflow for deliberate, careful shooting. The 67mm filter thread makes it easy to attach a wide range of standard circular filters without needing specialty adapters. At 700g, the lens is substantial enough to feel well-built in hand without adding excessive bulk to a medium format kit.
With no image stabilization, users working in lower light or at slower shutter speeds will want to work from a stable platform. Overall, this Sekor C prime is a purposeful medium format telephoto for Mamiya 645 system shooters.
Pros — Mamiya 150mm f/4
- ✓Fixed 150mm focal length provides consistent telephoto perspective with no variable aperture compromise
- ✓Maximum aperture of f/4 is well-suited to medium format telephoto work
- ✓67mm filter thread is a common, widely available size for easy filter compatibility
Cons — Mamiya 150mm f/4
- ✗Manual focus only — no autofocus support for fast-moving subjects
- ✗f/4 maximum aperture is relatively modest if you need shallower depth of field or low-light performance
- ✗No image stabilization, so handheld shooting at slower shutter speeds requires careful technique
Videos — Mamiya 150mm f/4
Mamiya 645 – Legendary cine lenses on a budget – Epic Episode #8 — Media Division