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Mamiya-Sekor 18cm (180mm) f/4.5 Seikosha-S Lens for TLR, Chrome {49}

Model #229207
  • $126.00

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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.
BN Bargain
$126.00
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UG Ugly
$41.00
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UG Ugly
Front Filter Ring Damaged
$29.00
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Mamiya TLR 180mm telephoto with built-in Seikosha-S leaf shutter

The Mamiya-Sekor 180mm f/4.5 extends the reach of the Mamiya TLR system with a focal length suited to portraits at working distance, compressed landscapes, and detail-oriented subject isolation on medium format film. The Seikosha-S leaf shutter sits inside the lens barrel itself, which means flash sync at any shutter speed, a genuine practical advantage for photographers mixing ambient and strobe light. The chrome finish is period-correct for classic Mamiya TLR bodies.

At f/4.5, the lens asks for deliberate exposure choices in low light, but the tradeoff is a compact, balanced package that pairs naturally with the twin-lens reflex shooting experience. The 49mm filter thread keeps the accessory footprint small. For anyone already working within the Mamiya TLR system who wants reach beyond the standard offerings, this lens fills that gap with a purpose-built design than an adapter compromise.

Who It's For

Portrait photographers shooting on medium format film will find the 180mm focal length puts comfortable distance between camera and subject while keeping the waist-level TLR experience intact. Documentary and editorial film shooters who work with flash benefit directly from the Seikosha-S leaf shutter's full-speed sync capability. Collectors and TLR enthusiasts building out a Mamiya interchangeable-lens kit will recognize the chrome finish as a match for classic Mamiya TLR bodies. Street and travel photographers who want a telephoto option without abandoning their TLR setup have a direct-mount solution here.

Key Features

  • 180mm focal length for TLR portraiture and subject isolation
  • f/4.5 maximum aperture with compact optical design
  • Seikosha-S leaf shutter enables flash sync at any speed
  • 49mm filter thread keeps accessory footprint small
  • Chrome finish matches vintage Mamiya TLR aesthetic
  • Mamiya TLR mount integrates with standard twin-lens bodies

FAQ

What shutter mechanism does this lens use?
The Seikosha-S leaf shutter is built into the lens barrel, which means you get flash sync at any shutter speed - a practical advantage when mixing ambient light with strobe.
What's the filter thread size?
49mm. The compact thread matches the lens's overall balanced proportions.
Is this lens compatible with all Mamiya TLR bodies?
Yes, the Mamiya TLR mount fits the full range of Mamiya twin-lens reflex cameras.
What focal length is this, and what subjects does it suit?
180mm, which extends your reach for portraits at working distance, compressed landscapes, and subject isolation on medium format film.
How does the f/4.5 aperture affect shooting in low light?
You'll need deliberate exposure choices and longer shutter speeds in dim conditions, but the tradeoff is a compact, balanced package built specifically for the Mamiya TLR system.
What finish does the chrome barrel have?
Chrome, which is period-correct for classic Mamiya TLR bodies.
SpecificationValue
Focal Length180mm
Max Aperturef/4.5
MountMamiya TLR
Filter Thread49mm
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
Filter Size 49mm
Focus Type Manual focus (only)
Lens Mount Mamiya TLR
Lens Type Short Tele / Portrait
Max Focal Length 180mm
Min Focal Length 180mm