Glass Bodies a variant-level encyclopedia of vintage lenses and cameras by iwillpat

Mamiya-Sekor Zoom Z 100–200mm f/5.2 W (RZ67)

Mamiya · Mamiya RZ67 · 1993

single source, unconfirmed

Also known as: Mamiya-Sekor Zoom Z 100-200mm f/5.2 W · Mamiya Sekor Z 100-200mm F5.2 W · Mamiya Sekor Zoom Z 100-200 5.2 · Mamiya RZ67 100-200mm f/5.2 Zoom · Mamiya RZ 100-200mm 5.2 W · Zoom Z100-200mm f/5.2W · マミヤ セコール ズーム Z 100-200mm F5.2 W · マミヤセコールZ 100-200mm F5.2W · マミヤ RZ67 100-200mm F5.2

Variants & identification

Variant Mount Years Serial ranges Production
Mamiya-Sekor Zoom Z 100–200mm f/5.2 W (the only version) Mamiya RZ67 — — —
  1. The two rings are described by Emulsive (the focal length ring and the focusing ring are on the front of the lens) and are visible in the Mamiya lens sheet's photograph; the sheet's minimum-focus figures carry an asterisk for the bellows fully extended, which implies the lens's own helicoid on top of the body's 46 mm.
  2. Weight, dimensions, angle and magnification are from Mamiya's Mamiya-Sekor Z Interchangeable Lenses sheet, whose minimum-focus column is measured from the lens front rim with the bellows fully extended (46 mm), not from the film plane; Japanese Wikipedia's 0.548 m is the wide-end figure from the film plane and is used in the spec fields; Mamiya's c. 1994 brochure prints 55–122 cm from wide to tele. The sheet's dimension column is read here as diameter × length. The sheet lists a screw-in hood; the 2004 brochure lists a slip-on Lens Hood ø80 No. 3 for the zoom, and the two are recorded rather than reconciled. Camera-wiki prints 14 elements in 5 groups, which disagrees with Mamiya's 12 groups and with Japanese Wikipedia; the maker's figure is used.
  3. The launch year is not known. The 1982 RZ67 manual has no zoom; Mamiya's Z lens sheet, whose cover shows the first RZ67 Professional, lists it, and the Pro II manual of 1993 counts zoom lenses among the system's. 1993 is the earliest dated Mamiya document that names it and is entered as a no-later-than year, not a launch date: single source.
  4. No aperture-blade count, coating description or list price in any currency was found in a Mamiya document; those fields are left empty rather than guessed.
How to tell them apart (expand)
  • RZ bayonet with 12 electrical contacts and a Seiko #1 electronic leaf shutter; no shutter-speed ring on the lens, since the body dial sets it. A 100–200mm f/5.2 with its own speed ring is the RB67's Mamiya-Sekor Zoom C 100–200mm f/5.2 W, a different lens that mounts on an RZ body with the dial at RBL
  • The only RZ lens with a focal-length ring and its own focusing ring; 109 mm across, 173 mm long and 1620 g, long enough that Mamiya sold a Lens Holder for it and excluded it from the Front Hood for G-3
  • One version only: there is no non-W, APO, L-A or M zoom

Mamiya-Sekor Zoom Z 100–200mm f/5.2 W (the only version):

  • Engraved MAMIYA-SEKOR ZOOM Z f=100–200mm 1:5.2 W; a focal-length ring and a helical focusing ring both on the front of the barrel, unlike every other RZ lens, which focuses by the body bellows alone¹
  • Mamiya-Sekor Z lens sheet: 14 elements in 12 groups, 48°–25°, f/45, 0.45× at 100 mm and 0.25× at 200 mm with the bellows fully extended (225 mm and 894 mm from the front rim), 48–97 mm equivalent, 77 mm filter, 109 × 173 mm, 1620 g²
  • Japanese Wikipedia: セコールズームZ 100-200mmF5.2W, 12群14枚, closest focus 0.548 m, φ77 mm screw-in
  • 2004 Pro IID brochure: still in the line-up as Zoom Z100~200mm f/5.2W, with its own Lens Holder, a slip-on Lens Hood ø80 No. 3 and a Zoom Lens Mounting Ring for the G-3 bellows hood

Specifications

Formula
Zoom, 14 elements in 12 groups (Mamiya-Sekor Z lens sheet; Japanese Wikipedia)
Construction
14 elements / 12 groups
Aperture range
f/5.2–f/45
Shutter
Seiko #1 electronic leaf shutter in the lens, 8s–1/400 plus B and T, set from the body dial; a mechanical 1/400 works without a battery
Min. focus
0.548 m
Dimensions
109 × 173 mm
Weight
1620 g
Filter
77 mm
Years manufactured
1993
Country
Japan

What reviewers say

Optical formula — Zoom, 14 elements in 12 groups (Mamiya-Sekor Z lens sheet; Japanese Wikipedia)

History

The 100–200mm f/5.2 is the only zoom lens Mamiya made for the RZ67 and, by the claim in Mamiya’s own 2004 Pro IID brochure, the first zoom for any 6×7 camera. It covers 48° to 25° across the frame, or 48–97 mm in 35 mm terms by Mamiya’s conversion, at a constant f/5.2 through the range. The Mamiya-Sekor Z lens sheet gives 14 elements in 12 groups, f/5.2 to f/45, a 77 mm filter and a barrel of 109 × 173 mm and 1620 g, among the heaviest lenses in the system, behind only the two 500s and the 75mm shift on Mamiya’s sheet. Japanese Wikipedia gives the closest focus as 0.548 m at the wide end and Mamiya’s c. 1994 brochure 55–122 cm across the range; the Mamiya sheet’s figures, 225 mm at 100 mm and 894 mm at 200 mm, are measured from the front rim with the bellows fully extended and correspond to 0.45× and 0.25×. The brochure says the optical performance approaches that of a single-focal-length lens, which is a maker’s claim, and sold a Lens Holder to support it, a slip-on ø80 No. 3 hood, and a mounting ring so the G-3 bellows hood could be used on it.

One version exists. The lens is absent from the 1982 RZ67 manual, appears on Mamiya’s Z lens sheet, whose cover still shows the first Professional body, is counted among the system’s lenses by the Pro II manual of 1993, and is still listed in the 2004 brochure. It was a W lens from the start, with the half-stop aperture ring that the W suffix denotes; no non-W, APO or M version was ever documented. No Mamiya source dates the launch, so the 1993 entered here is a no-later-than year. Camera-wiki prints the construction as 14 elements in 5 groups, which contradicts both Mamiya and Japanese Wikipedia; the maker’s 12 groups is used. The RB67 has a Mamiya-Sekor Zoom C 100–200mm f/5.2 W of the same 14-in-12 construction that mounts on an RZ body with the dial at RBL, but it carries its own shutter-speed ring and is a different lens with its own page.

The zoom is also the one RZ lens that does not focus by the body bellows alone. It carries a helical focusing ring on the front of the barrel beside the focal-length ring, and Pierre-Gilles Lucain’s Emulsive guide, the only review found, describes the resulting two-stage method: rough focus by the helicoid, fine focus by the bellows. He owns one, admits he does not like zooms and bought it for the range, and finds the focal-length ring hard to turn, the combination front-heavy and not easy hand-held, and the G-3 compendium usable only with a mounting ring that is now scarce. His verdict is that the range is the reason to have it. Nothing was found from the other review sites on the list, and forum threads on its sharpness against the primes were not readable and are not cited.

Buying advice is the RZ system’s plus the zoom’s mechanics. The Seiko #1 electronic leaf shutter fires only with a working 6 V battery in the body; without one it gives a mechanical 1/400 and nothing else. The shutter is cocked by the body’s lever with the mirror down, and the lens will not come off unless it is cocked. Run the shutter at 8 s and 1/400 and watch the blades, work the depth-of-field preview and T levers, and inspect the 12 rear contacts. On this lens, turn the focal-length ring from 100 to 200 and back and the focusing ring through its travel and feel for grinding or free play, check that the image stays in focus through the zoom on the screen, look for haze in a lens with this many air-glass surfaces, and confirm that the Lens Holder, if offered, is the 100–200 version, since Mamiya made separate holders for the 350 and 500.

What could not be sourced: the launch year, the number of aperture blades, a description of the coating, a list price in yen or dollars, and the year production ended. No designer is named anywhere.

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This history is AI-written, from the sources listed at the foot of the page. Where the record is silent it says so rather than filling the gap — but no human wrote these sentences.

Example photos

Sample photo taken with the Mamiya-Sekor Zoom Z 100–200mm f/5.2 W (RZ67)
RZ67 Pro with the Sekor Zoom Z 100–200mm f/5.2 and waist-level finder (Kazusan, 2009) — Kazusan, via Wikimedia Commons (CC BY-SA 3.0)

Sample photo wanted — shot with a Mamiya-Sekor Zoom Z 100–200mm f/5.2 W (RZ67)? We'd love to feature it (with credit).

Live listings

Asking price, USD: a median of $100 across 18 fixed-price listings on 2026-09-21 (middle half $68–$130). First day tracked.

Asking prices from the listings scanned, not sales; junk-flagged rows and auction lots excluded; other currencies are not converted.

Show 20 more listings

Buying from Yahoo! Auctions outside Japan. It is a domestic marketplace: sellers ship within Japan, and most will not register an overseas buyer. A proxy service bids on your behalf, receives the item and forwards it, for a fee and a wait. Buyee, Jauce and ZenMarket each accept a Yahoo auction number directly. Listed alphabetically for information — none is recommended over another, and none of these is an affiliate link.

Listings updated 2026-09-21. Links go to the shop or marketplace that carries the item.

Related: Mamiya-Sekor Z 110mm f/2.8 W (RZ67) · Mamiya-Sekor Z 127mm f/3.5 W (RZ67) · Mamiya-Sekor Z 150mm f/3.5 W (RZ67) · Mamiya-Sekor Z 180mm f/4.5 W-N (RZ67)

Sources (11)

Every page here is assembled from public sources, and the gaps are real ones. If you own this lens, know a serial number I'm missing, or can see where I have it wrong, tell me — corrections, serials and sample photos are all worth having.