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
Frequently Asked Questions — Mamiya 500mm f/5.6
Which camera bodies is this lens compatible with?+
The lens uses the Mamiya 645 mount, making it natively compatible with Mamiya M645-system camera bodies. No adapter is required for cameras in that system.
Does this lens support autofocus?+
No. The Mamiya Sekor C 500mm f/5.6 is a manual focus lens only. Photographers will need to focus by hand, which is worth factoring in when shooting moving subjects at this focal length.
What tripod or support setup is recommended?+
With a weight of 3000g, a robust tripod and head rated well above that load are strongly recommended. The lens has no image stabilization, so solid mechanical support is essential for sharp images at 500mm.
What filter size does this lens take?+
The lens has a 95mm front filter thread. Filters of this diameter are available but tend to be more expensive than smaller sizes, so factor that into the cost of ownership.
Is this lens suitable for medium format digital backs?+
The lens mounts on the Mamiya 645 system. Compatibility with a specific digital back will depend on whether that back is housed in a Mamiya 645-compatible body — check the mount compatibility of your particular digital back before purchasing.