Mamiya Sekor C 24mm f/4 Fisheye ULD Lens
The Mamiya 24mm f/4 Fisheye ULD is a 24mm f/4 lens designed for Mamiya 645 mount cameras. Used copies start from $2,203.2 on GearFocus, with buyer protection on every purchase.
Mamiya Sekor C 24mm f/4 Fisheye ULD Lens
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Lens Overview — Mamiya 24mm f/4 Fisheye ULD
Key Features — Mamiya 24mm f/4 Fisheye ULD
24mm Fisheye Prime: Fixed 24mm focal length delivers the characteristic ultra-wide curved perspective of a fisheye with no zoom compromises in optical design.
Mamiya 645 Mount: Native mount compatibility ensures seamless mechanical and optical integration with the Mamiya 645 system body lineup.
Medium Format Image Circle: Covers the larger image circle required by medium format, producing fisheye rendering across the full 645 frame.
ULD Optical Construction: Ultra Low Dispersion glass elements reduce chromatic aberration, helping maintain edge-to-edge sharpness across the wide fisheye field of view.
f/4 Maximum Aperture: Widest available aperture of f/4 is typical for a medium format fisheye and supports controlled depth of field across the expansive angle of view.
Manual Focus Design: Fully manual focus operation suits the deliberate, considered shooting pace common in medium format photography.
Lens Specifications — Mamiya 24mm f/4 Fisheye ULD
| Spec | Detail |
|---|---|
| Use Cases | Landscape, Architecture, Creative Effects |
| Lens Type | Fisheye |
| Format | Medium Format |
| Zoom/Prime | Prime |
| Focal Length | 24mm |
| Maximum Aperture | f/4 |
| Camera System | Medium Format |
| Lens Mount | Mamiya 645 |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Weight | 600g |
Description — Mamiya 24mm f/4 Fisheye ULD
The Mamiya Sekor C 24mm f/4 Fisheye is a prime lens built for the Mamiya 645 mount system, designed to bring fisheye-type perspective to medium format photography. With a fixed 24mm focal length and a maximum aperture of f/4, this lens is purpose-built for deliberate, creative shooting where the distinctive character of a fisheye rendering is the goal. It is a manual focus lens with no autofocus support, placing full control in the hands of the photographer.
At 600g, it has a weighty, confident feel appropriate for medium format glass. There is no image stabilization, and no filter thread size is listed — a common characteristic of fisheye designs where the curved front element prevents standard filter attachment. For photographers already working within the Mamiya 645 system who want to expand into fisheye perspectives, this lens is a specialized and distinctive addition to the kit.
Pros — Mamiya 24mm f/4 Fisheye ULD
- ✓Fixed 24mm focal length optimized as a dedicated prime for consistent fisheye rendering
- ✓Designed specifically for the Mamiya 645 mount, ensuring native compatibility with the system
- ✓Manual focus construction gives the shooter full optical control
Cons — Mamiya 24mm f/4 Fisheye ULD
- ✗Maximum aperture of f/4 limits light-gathering ability in lower-light situations
- ✗Manual focus only — no autofocus support for faster or spontaneous shooting
- ✗No image stabilization, requiring steady technique or faster shutter speeds
Videos — Mamiya 24mm f/4 Fisheye ULD
MEDIUM FORMAT FISHEYE | Mamiya SEKOR ULD C 24mm f/4 — The Whole Picture