* Item pictured for illustrative purposes only, actual item not pictured. See ‘Notes’ next to grade for included items.
Mamiya Sekor C 55mm f/2.8 N Manual Focus Lens for 645 {58}
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$260.00
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KEH Certified™ pre-owned gear, expertly inspected†
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All rental gear is between Excellent and Like New Minus condition
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Standard accessories included
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 |
Learn what to expect cosmetically from each grade. Images are representative and may not reflect the exact item. All gear is guaranteed functional unless noted. Accessories are typically not included unless listed. Like New through Bargain grades include a 180-day warranty. Items may also be available.
Exceptions
- New
- New in box complete with manufacturer's USA warranty. Not previously owned or used.
- Like New
- Essentially new with no signs of use. “Open box.” In manufacturer's packaging with original accessories and instructions. 180-day warranty.
- As Is
- Non-functional or damaged. Equipment will not work. Usable for parts. Not covered under KEH warranty and non-returnable.
Like New Minus
Like New Minus
Barely used with virtually no traces of wear. Only the closest inspections will reveal slight use. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Excellent Plus
Excellent Plus
Lightly used with limited signs of wear. Exceptionally nice but may have slight wear on finish visible. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Excellent
Excellent
Noticeably used with average signs of wear with the possibility of blemishes and/or minimal dings. Lens glass may have average dust and zoom/focus ring tension may have slight looseness or tightness overall, but will not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Bargain
Bargain
Heavily used with noticeable cosmetic and optical wear, but performance is mostly unaffected. May have dents, dings, or finish loss. Lens glass may have small scratches, dust, and blemishes, and zoom/focus ring tension may have moderate looseness or tightness overall. Accessories usually not included, unless noted in listing. 180-day warranty.
Ugly
Ugly
Heavily used with extensive visible wear. Equipment is rough, with multiple impressions in the finish, excessive finish loss and brassing. Glass will have marks, fungus and/or heavy/cloudy haze which could affect picture quality. Accessories usually not included, unless noted in listing. Not covered under KEH warranty.
