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

Mamiya-Sekor Z 90mm f/3.5 W (RZ67)

Mamiya · Mamiya RZ67 · 1982

single source, unconfirmed

Also known as: Mamiya-Sekor Z 90mm f/3.5 W · Mamiya Sekor Z 90mm F3.5 W · Mamiya Sekor Z 90mm f/3.5 · Mamiya RZ67 90mm f/3.5 · Mamiya RZ 90mm 3.5 · Z90mm f/3.5W · マミヤ セコール Z 90mm F3.5 W · マミヤセコールZ 90mm F3.5W · マミヤ RZ67 90mm F3.5

Variants & identification

Variant Mount Years Serial ranges Production
Mamiya-Sekor Z 90mm f/3.5 (1982, full-stop aperture ring) Mamiya RZ67 1982 — —
Mamiya-Sekor Z 90mm f/3.5 W (half-stop aperture ring) Mamiya RZ67 — — —
  1. The W designation is explained by Japanese Wikipedia (絞り目盛の間隔が広くなり、1/2段絞りが追加された: wider aperture-scale spacing, half stops added) and by Emulsive (half-stop markings, optics unchanged). No Mamiya document consulted states the year the W barrel replaced the plain Z.
  2. Construction, angle of view, minimum aperture and closest focus for the 1982 lens are from the RZ67 Professional instruction manual's lens table. The manual gives no weights.
  3. Weight, dimensions 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. The sheet's dimension column is read here as diameter × length.
  4. Japanese Wikipedia's product list gives the 90mm F3.5W as 7群8枚 (8 elements in 7 groups) and 0.448 m; both Mamiya documents consulted, the 1982 manual and the lens sheet, print 6 elements in 6 groups, and the maker's figure is used here. The discrepancy is recorded rather than resolved.
  5. 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)
  • Every version: 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 90mm with its own speed ring is the RB67's 90mm f/3.8, a different lens
  • No W on the name ring and a full-stop aperture ring means the 1982 lens; W with half-stop clicks means the later barrel
  • 77 mm filter thread and a screw-in hood on both versions; the lens sheet's 97 × 82 mm barrel is 20 mm longer than the 110mm's

Mamiya-Sekor Z 90mm f/3.5 (1982, full-stop aperture ring):

  • Engraved MAMIYA-SEKOR Z f=90mm 1:3.5 with no W after the aperture; aperture ring clicks at full stops only¹
  • 1982 RZ67 instruction manual: 6 elements in 6 groups, 53° angle of view, f/32 minimum, 43 cm closest focus, 77 mm screw-in filter and hood²
  • Listed by the 1982 manual as one of the three standard lenses of the RZ67 Professional, with the 110mm f/2.8 and 127mm f/3.8

Mamiya-Sekor Z 90mm f/3.5 W (half-stop aperture ring):

  • W after the aperture on the name ring; aperture ring with half-stop clicks and wider scale spacing¹
  • Mamiya-Sekor Z lens sheet: 6 elements in 6 groups, 53°, f/32, 0.51× at full bellows extension (197 mm from the front rim), 44 mm equivalent, 77 mm filter, 97 × 82 mm, 690 g³

Specifications

Construction
6 elements / 6 groups
Aperture range
f/3.5–f/32
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
0.43 m
Dimensions
97 × 82 mm
Weight
690 g
Filter
77 mm
Years manufactured
1982
Country
Japan

What reviewers say

Optical formula

History

The 90mm f/3.5 was one of three lenses the 1982 RZ67 Professional manual lists as standard, with the 110mm f/2.8 and the 127mm f/3.8, and it is the widest of the three: 53° across the 6×7 frame, or about 44 mm in 35 mm terms by Mamiya’s own conversion. The manual gives 6 elements in 6 groups, f/3.5 to f/32, a closest focus of 43 cm and a 77 mm screw-in filter; Mamiya’s later Mamiya-Sekor Z lens sheet adds a 97 × 82 mm barrel and 690 g, and a magnification of 0.51× with the body’s 46 mm bellows racked out. With Mamiya’s extension tubes 1 and 2 stacked the 90 reaches 1.92×, which English Wikipedia and the 1982 close-up table both give as the largest magnification of any RZ lens, a distinction that makes it the RZ’s nearest thing to a macro lens short of the 140mm.

Two versions exist and they differ in the aperture ring only. The 1982 lens is engraved Mamiya-Sekor Z 90mm 1:3.5 and clicks at full stops; the W barrel that replaced it carries a W after the aperture, a wider-spaced scale and half-stop clicks. Japanese Wikipedia describes the W change in those terms and Pierre-Gilles Lucain’s Emulsive guide says the non-W lenses were made only for the first Professional body and are optically identical. No Mamiya document consulted dates the change. Japanese Wikipedia’s product list also gives the 90 W as 8 elements in 7 groups, which contradicts both Mamiya documents; the maker’s 6 in 6 is used here and the disagreement is noted. English Wikipedia mentions a prototype 90mm f/3.5 M L-A with a floating system, of which no Mamiya record was found.

The 90 has attracted less writing than the 110. Lucain includes it in his lens guide but does not own one, and says so, so his entry is a description rather than a verdict; his general argument, that the plain W lenses are excellent and the APO and L-A premiums are optional, is the nearest thing to a review found. John Adams III’s Shoot It With Film review praises a 90mm on an RZ67, but his lens is the RB67’s 90mm f/3.8, a different optic that mounts on the RZ with the dial at RBL, and it is set aside here. The 90 is the RZ lens most likely to be confused with its RB cousin in listings: the RZ lens has no shutter-speed ring, and the aperture is f/3.5, not f/3.8.

Buying advice is the RZ system’s. The Seiko #1 electronic leaf shutter in the lens 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, so a lens that refuses to release is usually a cocking-state matter. 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. Lucain warns against over-tightening the breech ring.

What could not be sourced: the number of aperture blades, a description of the coating, a list price in yen or dollars, a weight for the 1982 non-W barrel, the year the W barrel arrived, and the year production ended. No designer is named anywhere.

Expand Collapse

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 Z 90mm f/3.5 W (RZ67)
RZ67 Professional II with the Sekor Z 90mm f/3.5 W and a Phase One back (Rob Ellis) — Rob Ellis from Leeds, England, via Wikimedia Commons (CC BY 2.0)

Sample photo wanted — shot with a Mamiya-Sekor Z 90mm f/3.5 W (RZ67)? We'd love to feature it (with credit).

Live listings

Asking price, USD: a median of $410 across 37 fixed-price listings on 2026-09-19 (middle half $320–$700). First day tracked.

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

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Listings updated 2026-09-19. Links go to the shop or marketplace that carries the item.

Related: Mamiya-Sekor Z 110mm f/2.8 W (RZ67) · Mamiya-Sekor Z 180mm f/4.5 W-N (RZ67) · Mamiya-Sekor Z 250mm f/4.5 W / APO (RZ67) · Mamiya-Sekor Z 50mm f/4.5 W (RZ67) · Mamiya-Sekor Z 65mm f/4 W (RZ67)

Sources (8)

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.