Mamiya M645 500mm f/5.6 Sekor C Lens
The Mamiya 500mm f/5.6 is a 500mm f/5.6 lens designed for Mamiya 645 mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Mamiya M645 500mm f/5.6 Sekor C Lens
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Lens Overview — Mamiya 500mm f/5.6
Key Features — Mamiya 500mm f/5.6
500mm Prime Focal Length: Dedicated super telephoto reach on medium format, suited to distant subjects like wildlife and sports.
Mamiya 645 Native Mount: Mounts directly to M645-system bodies without adapters, ensuring full mechanical compatibility.
f/5.6 Maximum Aperture: A practical maximum aperture for a telephoto of this focal length and medium format coverage.
Medium Format Coverage: Designed to cover the 645 medium format frame, delivering the full resolving potential of medium format film or digital backs.
Manual Focus Operation: Fully manual focus design intended for deliberate, controlled shooting from a tripod or fixed support.
95mm Filter Thread: Large front filter thread accommodates 95mm filters for polarizers, ND filters, or other optical accessories.
Lens Specifications — Mamiya 500mm f/5.6
| Spec | Detail |
|---|---|
| Use Cases | Wildlife, Sports, Birding |
| Lens Type | Super Telephoto |
| Format | Medium Format |
| Zoom/Prime | Prime |
| Focal Length | 500mm |
| Maximum Aperture | f/5.6 |
| Camera System | Medium Format |
| Lens Mount | Mamiya 645 |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 95mm |
Description — Mamiya 500mm f/5.6
The Mamiya Sekor C 500mm f/5.6 is a prime, manual focus telephoto lens purpose-built for the Mamiya 645 medium format system. With a focal length sitting squarely in the super telephoto range, it provides serious reach for medium format photographers working in genres where distance is a factor. The maximum aperture of f/5.6 keeps the lens at a manageable size relative to its focal length, though the overall weight of 3000g still makes this a substantial optic requiring dedicated support.
There is no image stabilization, so a solid tripod setup is essential for consistent results. The 95mm front filter thread accommodates large-diameter filters appropriate for a telephoto of this specification. For Mamiya 645 system users who need a native-mount, format-matched super telephoto prime, the Sekor C 500mm f/5.6 fills a specific and demanding role in the lineup.
Pros — Mamiya 500mm f/5.6
- ✓Native Mamiya 645 mount ensures direct, no-adapter compatibility with M645-system bodies
- ✓500mm prime focal length delivers dedicated super telephoto reach on medium format
- ✓f/5.6 maximum aperture is a practical choice for a lens of this focal length and format
Cons — Mamiya 500mm f/5.6
- ✗At 3000g, the lens is very heavy and essentially requires dedicated tripod or support for use
- ✗Manual focus only — no autofocus capability for tracking moving subjects
- ✗No image stabilization, compounding the challenge of shooting at 500mm without mechanical support
Videos — Mamiya 500mm f/5.6
Mamiya 645 – Legendary cine lenses on a budget – Epic Episode #8 — Media Division