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Mamiya-Sekor 18cm (180mm) f/4.5 Seikosha-MX Lens for TLR, Chrome {40.5} Speeds to 1/400

Model #392657
  • $56.00

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New in box complete with manufacturer's USA warranty. Not previously owned or used.
Essentially new with no signs of use. “Open box.” In manufacturer's packaging with original accessories and instructions. 180-day warranty.
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.
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.
Noticeably used with average signs of wear. Shows moderate wear for the age of the item, 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.
Frequently used with above-average wear. 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, but should not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
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.
Non-functional or damaged. Equipment will not work. Usable for parts. Not covered under KEH warranty and non-returnable.
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Mamiya-Sekor 180mm f/4.5 TLR portrait telephoto with leaf shutter sync

The 180mm focal length on a Mamiya TLR puts you in classic portrait-telephoto territory for medium format work, giving you working distance and subject separation that shorter lenses on this system simply cannot match. The Seikosha-MX leaf shutter is the key mechanical feature here: sync at any speed up to 1/400s means you can balance ambient light with flash without the restrictions a focal plane shutter would impose. That matters in daylight portraiture and controlled studio work alike.

The chrome finish places this lens in an earlier production run of the Mamiya TLR lineup, and the 40.5mm filter thread keeps your filtration options straightforward. Because the shutter lives in the lens barrel than the body, this glass is a self-contained optical and mechanical unit. For anyone already shooting a Mamiya TLR system, adding this focal length means a meaningful step out from the standard lens range without changing systems or workflows. That combination of telephoto reach and full-sync flash capability at f/4.5 is genuinely hard to replicate at this format size.

Who It's For

Portrait photographers working with a Mamiya TLR will find the 180mm useful for head-and-shoulder framing with comfortable subject distance. Studio shooters benefit directly from the Seikosha-MX leaf shutter's 1/400s top speed, which allows flash sync at any shutter speed for precise ambient-fill ratios. Documentary and street photographers using medium format for deliberate, slower-paced work get a telephoto option that stays within the Mamiya TLR mount ecosystem. Film photographers shooting medium format who already own Mamiya TLR bodies can add a dedicated telephoto lens without investing in an entirely separate camera system.

Key Features

  • Seikosha-MX leaf shutter syncs at any speed to 1/400s
  • 180mm fixed focal length telephoto for Mamiya TLR
  • f/4.5 maximum aperture
  • 40.5mm filter thread
  • Chrome finish indicates earlier production
  • Self-contained optical and mechanical unit

FAQ

What shutter sync speed does this lens offer?
The Seikosha-MX leaf shutter syncs at any speed up to 1/400s, meaning you can use flash with any shutter speed without the X-sync limitations of a focal plane shutter.
Is this lens compatible with all Mamiya TLR bodies?
Yes, it mounts to any camera in the Mamiya TLR system. The leaf shutter is built into the lens barrel, so it works independently of the camera body.
What filter size does this lens use?
40.5mm filters thread directly onto the front element.
How does 180mm perform for portraiture on medium format?
At 180mm on a 6x6 negative, you get working distance and subject separation that standard lenses on the Mamiya system cannot match, making it a classic portrait telephoto choice for the format.
Why does the chrome finish matter?
The chrome finish indicates this lens is from an earlier production run of the Mamiya TLR lineup. It's a cosmetic indicator of vintage manufacturing but doesn't affect optical or mechanical performance.
Can you use this lens with flash in daylight?
Yes. Full sync at any speed up to 1/400s lets you balance ambient light with flash fill without the sync restrictions you'd face with a focal plane shutter.
Is the 180mm a fixed focal length?
Yes, this is a fixed 180mm lens with no zoom range.
SpecificationValue
Focal Length180mm
Max Aperturef/4.5
MountMamiya TLR
Filter Thread40.5mm
Max Shutter Speed1/400s
FinishChrome

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
Lens Mount Mamiya TLR
Max Focal Length 180mm
Min Focal Length 180mm