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

Mamiya K/L 350mm f/5.6 APO L (RB67)

Mamiya · Mamiya RB67 · 1990

single source, unconfirmed

Also known as: Mamiya 350mm f/5.6 APO RB67 · Mamiya RB67 350mm APO · Mamiya K/L 350mm f/5.6 APO L · KL 350mm f/5.6 L APO · APO-KL 350mm F5.6 L · Mamiya APO KL 350mm · Mamiya 350 5.6 APO RB · マミヤ KL 350mm F5.6 APO · マミヤ RB67 350mm アポ · アポ KL 350mm F5.6

Variants & identification

Variant Mount Years Serial ranges Production
Mamiya APO-K/L 350mm f/5.6 L (Pro-SD generation, the only version) · Seiko #1 mechanical leaf shutter, 1s–1/400, T and B Mamiya RB67 1990 — —
  1. Optical and physical figures are from Mamiya's APO lens booklet at butkus.org and from Mamiya's own Pro SD lens page (the Mamiya Leaf legacy site, saved as a PDF at ianbfoto.com). They agree on the design, the size and the 1,440 g, and differ on the closest focus: the booklet's 3,081 mm is measured from the front rim, the lens page's 3,423 mm (also given by Japanese Wikipedia) does not say from where. The lens-page figure is the one in the table. The RB67 Camera Guide's index gives the same 1,440 g; its own lens page for the 350 could not be read.
  2. The 1990 date is the RB67 Pro-SD's; no source consulted dates the 350 APO separately from the other Pro-SD lenses, and the RB67 Camera Guide believes the K/L 360mm f/6 L was sold before the 350 APO appeared. No last year and no Mamiya list price has been found.
  3. Reviews on the listed sites do not cover the RB 350 APO; the Emulsive guide quoted is about the RZ67's APO 350mm, which the RZ67 Pro IID brochure lists as the same 7-element, 6-group design at 1,455 g.
How to tell them apart (expand)
  • One version only: APO on the barrel, K/L in the name and a blue line around the front
  • 184.2 mm long and 1,440 g, supplied with a tripod support bracket (Mamiya Pro SD lens page); the Pro-SD manual lists the same 77 mm screw-in hood for the 140 to 350 lenses and a separate one for the 360
  • Takes 77 mm screw-in filters and focuses on the body's bellows
  • A 7 mm adapter ring at the rear that comes off for a Pro-SD or an RZ67; the lens goes on a Pro-S with the ring removed (APO booklet)

Mamiya APO-K/L 350mm f/5.6 L (Pro-SD generation, the only version):

  • APO on the barrel, K/L rather than Sekor in the name, and a blue line around the front of the lens, the mark the RB67 Camera Guide gives for the APO/L lenses
  • Mamiya's APO booklet: 7 elements in 6 groups, automatic diaphragm, minimum aperture f/45, closest focus 3,081 mm from the front rim, area covered 420 × 521 mm, 77 mm filter, screw-in hood attached, 184.2 mm long × 97.2 mm across, 1,440 g; angle of view 14°40' diagonal
  • Mamiya's Pro SD lens page: 15°, 3,423 mm closest focus, 0.13×, 184.2 × 97.2 mm, 3 lb 3 oz (1,440 g); 'The 350mm APO lens includes tripod support bracket'
  • Removable 7 mm lens mount adapter ring at the rear, fitted for a Pro or Pro-S and removed for a Pro-SD (Pro-SD manual, APO booklet)

Serial-range notes

two-letter sticker on the rear of the lens
Mamiya dated RB and RZ lenses with a two-letter code stuck to the back of the lens: the first letter is the year, the second the month, A = January. Year letters run A–T for 1981–2000 and A–N for 2001–2014, which covers the whole life of this lens (Mamiya Repair). No serial-to-year table for the 350 APO has been published.

Specifications

Formula
7 elements in 6 groups; two elements of ultra-low dispersion glass and four of anomalous dispersion glass (Mamiya APO lens booklet)
Construction
7 elements / 6 groups
Aperture range
f/5.6–f/45
Shutter
Seiko #1 mechanical leaf shutter, 1s–1/400 and T, X sync at all speeds (Mamiya Pro SD lens page); the Pro-SD generation's lenses add a built-in bulb (B) unit (Pro-SD manual). Focusing is by the body's bellows, so the lens has no helicoid.
Min. focus
3.423 m
Dimensions
97.2 × 184.2 mm
Weight
1440 g
Filter
77 mm
Years manufactured
1990
Country
Japan
Coating
Multicoated; Mamiya's Pro SD lens page describes its 'proprietary multi-coating process' for the whole line

What reviewers say

Optical formula — 7 elements in 6 groups; two elements of ultra-low dispersion glass and four of anomalous dispersion glass (Mamiya APO lens booklet)

History

The 350mm f/5.6 APO is the long telephoto of the RB67 Pro-SD’s apochromatic series, and a new focal length for the system: the RB’s older long lens is the 360mm f/6.3, which is why Mamiya’s APO booklet tells the user to set the body’s focal-length scale to the 360 mm mark and read the 360 mm exposure correction when the bellows are extended. The booklet gives 7 elements in 6 groups, “two lenses that use ultra low dispersion glass with four out of the remaining five lenses using anomalous dispersion glass”, correction across 400 to 1,000 nm so that focus does not shift into the infrared, spherical aberration, astigmatism and field curvature held under 0.1 mm, pincushion distortion under 1%, an automatic diaphragm to f/45, a 77 mm filter thread with the screw-in hood supplied, 184.2 mm of length by 97.2 mm across and 1,440 g. The closest focus is 3,081 mm from the front rim by the booklet, or 3,423 mm by Mamiya’s later Pro SD lens page and Japanese Wikipedia, which do not say where they measure from.

That lens page, kept on the Mamiya Leaf site until 2013, gives 15°, 0.13×, 167 mm as the 35 mm equivalent, lists “long distance landscape, aerial, industrial and wildlife photography” as its uses and says the lens “includes tripod support bracket”: at 184 mm and 1.44 kg on the front of a bellows camera the lens needs the support, and the RZ67 Pro IID brochure lists a lens holder for the 350 in the same way. Like every RB lens it has a Seiko #1 leaf shutter, 1 second to 1/400 with sync at every speed, and the Pro-SD generation’s built-in bulb unit gives it B as well as T. It has no helicoid; the body’s bellows focus it.

There is one version, marked APO on the barrel with K/L rather than Sekor in the name and the blue line around the front that the RB67 Camera Guide gives as the APO/L mark. The lens to distinguish it from is the K/L 360mm f/6 L, the Pro-SD generation’s non-APO long lens, which the Camera Guide believes was sold before the 350 APO appeared and about which it could find no optical details. The Pro-SD enlarged the throat from 54 to 61 mm, so the 350 carries a 7 mm lens mount adapter ring at the rear that stays on for a Pro or Pro-S and comes off for a Pro-SD or an RZ67; the booklet says the 210, 250 and 350 APO lenses go on a Pro-S that way, while the 500 APO does not fit one. Reznitsky’s chart agrees, and the Emulsive guide adds that an RB lens on an RZ needs the bellows extended 7 mm to reach infinity.

No review on the sites consulted covers the RB 350 APO itself. Pierre-gilles Lucain’s Emulsive guide to the RZ67, whose APO 350mm the Pro IID brochure lists as the same 7-element, 6-group design, thinks the APO correction “very useful in color photography but quite useless for black and white” and notes that Mamiya’s support bracket for the 350/360 fits the 350 and sits awkwardly on the slightly shorter 360. Mark Foster at Japan Camera Hunter treats the C-versus-K/L question as a division among owners. What to check is what any RB lens needs: every shutter speed, the slow ones especially, the cocking action on and off the body, the diaphragm blades, that the adapter ring is present if the lens is going on a Pro or Pro-S, and that the support bracket is with it. Open questions: the first and last years of production beyond the Pro-SD’s 1990, and any list price from Mamiya, none having been found.

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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 wanted — shot with a Mamiya K/L 350mm f/5.6 APO L (RB67)? We'd love to feature it (with credit).

Live listings

Asking price, USD: a median of $690 across 3 fixed-price listings on 2026-09-21 (middle half $620–$690). First day tracked.

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

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

Related: Mamiya K/L 210mm f/4.5 APO L (RB67) · Mamiya-Sekor 250mm f/4.5 (RB67) · Mamiya-Sekor 360mm f/6.3 (RB67) · Mamiya APO-L 500mm f/6 L (RB67)

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.