Mamiya 250mm f/4.5 Sekor Lens
The Mamiya 250mm f/4.5 is a 250mm f/4.5 lens designed for Mamiya 645 mount cameras. Used copies start from $127.49 on GearFocus, with buyer protection on every purchase.
Mamiya 250mm f/4.5 Sekor Lens
Used Mamiya 250mm f/4.5 Listings on GearFocus
Lens Overview — Mamiya 250mm f/4.5
Key Features — Mamiya 250mm f/4.5
250mm Telephoto Prime: Fixed focal length delivers a dedicated telephoto perspective on the Mamiya 645 medium format platform, well suited for portraiture and distant subjects.
f/4.5 Maximum Aperture: Provides usable light-gathering capability for a medium format telephoto, allowing for subject separation and shooting in moderate lighting conditions.
Mamiya 645 Mount: Designed specifically for the Mamiya 645 system, ensuring native optical alignment and full compatibility with Mamiya 645 camera bodies.
Manual Focus Design: Full manual focus control places precise focusing decisions in the shooter's hands, consistent with professional medium format workflows of its era.
77mm Filter Thread: Widely supported filter size gives direct access to polarizers, ND filters, and other accessories without requiring step-up rings.
Medium Format Coverage: Optical formula is designed to cover the larger 645 medium format frame, delivering detail and rendering that exceeds what standard 35mm lenses can produce.
Lens Specifications — Mamiya 250mm f/4.5
| Spec | Detail |
|---|---|
| Use Cases | Portrait, Wildlife, Landscape |
| Lens Type | Prime |
| Format | Medium Format |
| Zoom/Prime | Prime |
| Focal Length | 250mm |
| Maximum Aperture | f/4.5 |
| Camera System | Medium Format |
| Lens Mount | Mamiya 645 |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 77mm |
Description — Mamiya 250mm f/4.5
The Mamiya 250mm f/4.5 Sekor is a prime telephoto lens built for the Mamiya 645 mount, placing it squarely within the medium format camera ecosystem. Its fixed 250mm focal length puts it in telephoto range, giving photographers a single, committed perspective ideal for subjects that benefit from longer reach and compression. The maximum aperture of f/4.5 offers a reasonable amount of light transmission for a telephoto prime of this focal length.
Focus is entirely manual, giving the photographer direct, tactile control over where sharpness falls in the frame. There is no image stabilization, so steady technique or a solid support system is important, especially given the lens's weight of 1200g. The 77mm filter thread opens up compatibility with a broad selection of readily available filters.
As a dedicated medium format lens, it is engineered to cover the larger image circle that medium format systems demand, and its Mamiya 645 mount ensures a native, purpose-built fit for compatible camera bodies.
Pros — Mamiya 250mm f/4.5
- ✓Fixed 250mm focal length delivers a dedicated telephoto perspective for medium format shooting
- ✓Maximum aperture of f/4.5 provides usable light-gathering capability for a telephoto prime
- ✓77mm filter thread size is a widely supported standard, offering broad filter compatibility
Cons — Mamiya 250mm f/4.5
- ✗No image stabilization (specifications list 'None'), so a tripod or monopod is advisable
- ✗Manual focus only — no autofocus support, which may slow down fast-moving subject work
- ✗1200g weight is substantial and adds significant load to a medium format kit
Videos — Mamiya 250mm f/4.5
Mamiya RB67 lenses - Buyer's Checklist — Jonathan Harris at Worldwide Camera Exchange
Frequently Asked Questions — Mamiya 250mm f/4.5
What camera mount does this lens fit?+
This lens is designed for the Mamiya 645 mount. It is built specifically for that system, so verify your camera body uses the Mamiya 645 mount before purchasing.
Does this lens have autofocus?+
No. The lens is manual focus only, as indicated in the specifications. All focusing must be done by hand using the focus ring.
What filter size does this lens use?+
The lens has a 77mm filter thread size, which is a common and widely available diameter compatible with many polarizing, ND, and UV filters on the market.
How heavy is this lens?+
The lens weighs 1200g. Given this weight, using a tripod or monopod is recommended for comfortable extended shooting sessions.
Does this lens have image stabilization?+
No, the specifications confirm image stabilization is listed as 'None.' Photographers should account for this when shooting handheld, particularly at slower shutter speeds.
Is this a zoom or prime lens?+
This is a prime lens with a fixed focal length of 250mm. There is no zoom capability; the focal length does not change.