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Mamiya Sekor C 55mm f/2.8 N Manual Focus Lens for 645 {58}
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$405.00
Mamiya Sekor C 55mm f/2.8 N, the standard lens for 645 shooters.
On a Mamiya 645 body, 55mm lands close to the classic normal focal length, giving you a field of view that mirrors how the eye naturally reads a scene. The f/2.8 maximum aperture is fast enough for available-light work without making the lens a burden to carry, and the 58mm filter thread keeps your existing filter kit in play. Manual focus is the only mode here, which suits medium format work well, there's no motor hunting, no electronic dependency, just a direct mechanical connection between your hand and the focus ring.
The N-type designation marks this as a later iteration in the Sekor C line, reflecting refinements Mamiya made to the optical formula and barrel construction over the system's long production run. For anyone already shooting 645, this is the kind of lens that earns a permanent spot in the bag. For those just entering medium format, a 55mm f/2.8 is a logical first lens: wide enough to be useful for environmental work, tight enough to produce clean portraits, and fast enough to function indoors without a tripod.
Who It's For
Documentary and editorial photographers get a workhorse focal length that renders scenes without obvious distortion and handles dim interiors at f/2.8. Portrait photographers shooting on Mamiya 645 bodies will find 55mm produces natural facial proportions with enough subject separation to separate a subject from a background. Film photographers building a 645 kit around the Mamiya system benefit from the N-type's refined barrel and the fact that 58mm filters are cheap and widely available. Travel photographers who want medium format quality without hauling multiple lenses will find this focal length covers a broad range of situations in one mount.
Key Features
- 55mm focal length on Mamiya 645 mount
- f/2.8 maximum aperture for available-light work
- Manual focus with direct mechanical control
- 58mm filter thread for existing filter compatibility
- N-type optical and mechanical refinement
- Medium format 645 system lens
FAQ
- What focal length equivalent is 55mm on a 645 body?
- On 645's larger frame, 55mm sits near the classic normal focal length - roughly equivalent to 43-45mm on 35mm film, giving you a natural, eye-level field of view.
- Is manual focus a limitation on this lens?
- No. Manual focus on medium format is an asset, not a compromise - there's no AF motor hunting, no batteries to fail, just direct mechanical control over focus.
- Can I use my existing 58mm filters with this lens?
- Yes. The 58mm filter thread means any ND, polarizer, or protective filter you already own will screw on directly.
- What does the N-type designation mean?
- N-type signifies a later revision in the Sekor C line with refinements to the optical design and barrel construction, made later in the system's production run.
- Is f/2.8 fast enough for indoor work without a tripod?
- At f/2.8 on fast film or with a modern digital 645 back at higher ISOs, yes - you can shoot indoors without a tripod at usable shutter speeds.
- What subject distances does this lens cover?
- Typical close-focus distance for this focal length is around 0.3m, making it suitable for both environmental work and tight portrait framing.
| Specification | Value |
|---|---|
| Focal Length | 55mm |
| Max Aperture | f/2.8 |
| Mount | Mamiya 645 |
| Filter Thread | 58mm |
This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.
| Brand Name | Mamiya |
|---|---|
| Filter Size | 58mm |
| Focus Type | Manual focus (only) |
| Lens Mount | Mamiya M645 |
| Lens Type | Standard / Normal |
| Max Focal Length | 55mm |
| Min Focal Length | 55mm |
