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

Mamiya 645 AF 45mm f/2.8

Mamiya · Mamiya 645 AF · 1999

single source, unconfirmed

Also known as: Mamiya AF 45mm f/2.8 · Mamiya 645AF 45mm f2.8 · Mamiya 645 AF 45mm f/2.8 · Mamiya AF45mm F2.8 · Mamiya AF 45mm f/2.8 D · Mamiya 45mm f2.8 D · Phase One 45mm f/2.8 D · マミヤ AF 45mm F2.8 · マミヤ645AF 45mm F2.8 · マミヤ AF 45mm F2.8 D

Variants & identification

Variant Mount Years Serial ranges Production
Mamiya AF 45mm f/2.8 (1999 original) Mamiya 645 AF 1999 — —
Mamiya AF 45mm f/2.8 D Mamiya 645 AF — — —
  1. Element count, angle of view, closest focus, magnification, filter size, dimensions and weight for the original are from Mamiya's 645AF Interchangeable Lenses instruction sheet (cameramanuals.org); the D lens's figures come only from the Wikipedia lens table.
  2. Weight: Mamiya's two sheets print 495 g and 492 g for the original; Wikipedia gives 530 g for the D. The later Mamiya figure is carried in the table.
  3. No source consulted gives the aperture blade count, a list price, or the year of the D version; camera-wiki's autumn 2008 list shows only the plain lens.
How to tell them apart (expand)
  • AF 45mm f/2.8 with or without D on the name ring; no aperture ring on either, unlike the manual-focus Sekor C 45mm f/2.8 of the M645 mount
  • Both versions are 9 elements in 7 groups, focus to 0.45 m and take 67 mm filters (Mamiya sheet; Wikipedia table)

Mamiya AF 45mm f/2.8 (1999 original):

  • Name ring reads AF 45mm f/2.8 with no D; no aperture ring (Mamiya instruction sheet)
  • Mamiya's instruction sheet: 9 elements in 7 groups, 74° angle of view, f/22 minimum, 0.45 m closest focus, 0.13× magnification, 67 mm filter, 73.5 mm long, 77 mm diameter, 495 g (the earlier sheet prints 492 g)
  • Focus collar slides forward for AUTO FOCUS and back for manual; the AFD manual also lets the body's focus mode lever switch it to M

Mamiya AF 45mm f/2.8 D:

  • D after the aperture on the name ring; Japanese Wikipedia lists the lens as AF 45mm F2.8 D
  • Wikipedia's lens table gives the D the same 9 elements in 7 groups, 0.45 m and 67 mm filter as the original, at 530 g against Mamiya's 495 g for the original

Specifications

Formula
9 elements in 7 groups (Mamiya 645AF Interchangeable Lenses instruction sheet)
Construction
9 elements / 7 groups
Aperture range
f/2.8–f/22
Min. focus
0.45 m
Dimensions
77 × 73.5 mm
Weight
495 g
Filter
67 mm
Years manufactured
1999
Country
Japan
Coating
Multicoated: Mamiya America's 2000 lens brochure describes every element as coated with Mamiya's proprietary multicoating; the D lens carries coatings redesigned for digital sensors (dpreview, 2015)

What reviewers say

History

The AF 45mm f/2.8 is the wide-angle of the Mamiya 645AF launch line of 1999, a 74° lens that stands in for a 29mm on 35mm film. Mamiya’s instruction sheet gives nine elements in seven groups, f/22 minimum, 0.45 m closest focus at 0.13× magnification, a 67 mm filter thread, 73.5 mm length, 77 mm diameter and 495 g (the earlier sheet says 492 g). Like every 645 AF lens it has no aperture ring, the aperture being set from the body, and the autofocus motor is in the body rather than the lens. It is a different lens from the manual-focus Sekor C 45mm f/2.8 of the M645 mount, which fits the AF bodies only for stop-down metering.

Two versions exist and the name ring tells them apart. The original AF 45mm f/2.8 appears on both of Mamiya’s 645AF lens sheets and on camera-wiki’s autumn 2008 list; its focus collar slides forward for autofocus and back for manual. The AF 45mm f/2.8 D followed in the Phase One era, when the lenses were also sold under Phase One’s name: Japanese Wikipedia lists the family as AF 45mm F2.8 D, and the Wikipedia table gives the D the same 9/7 construction, 0.45 m and 67 mm filter at 530 g. Wikipedia glosses D as optimised for digital sensors; Damien Demolder’s 2015 field test of the Phase One 645DF+ says the coatings and exit light path were reworked for digital while the barrels stayed those of the film era. No source consulted dates the D or describes any change to the glass itself.

Reviewers rate the original well without calling it the star of the line. Popular Photography’s April 2000 bench test put centre resolution at excellent from f/2.8 to f/22 and corners at very good wide open, rising to excellent from f/8, figures that matched or beat the Contax Distagon 45mm f/2.8 in the corners at most apertures. Spencer Lookabaugh, who uses the 45mm and 80mm as his main lenses on a 645AFD, calls it tack sharp from f/2.8. Teo Totev’s later comparison on digital backs gives it 6 for sharpness and 5 for bokeh, level with the 55mm and a step behind the 80mm. Everyone’s complaints concern the body: single-shot AF is quick in good light, continuous AF is poor, and the single centre focus point means constant recomposing.

When buying, check the rear electronic contacts for corrosion and scratches, that the focus collar clicks between its two positions, and that the body reports the lens’s aperture. Listings mix AF, 645AF, AFD and Phase One freely; the manual-focus 45mm f/2.8 and 45mm f/2.8 N of the M645 mount have an aperture ring and are not this lens.

What remains open: the aperture blade count, list prices, the year the D version appeared, and Mamiya’s own data sheet for the D.

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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 645 AF 45mm f/2.8? We'd love to feature it (with credit).

Live listings

Asking price, USD: a median of $400 across 9 fixed-price listings on 2026-09-21 (middle half $390–$650). First day tracked.

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

Show 4 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 645 AF 35mm f/3.5 · Mamiya 645 AF 80mm f/2.8 · Mamiya 645 AF 120mm f/4 Macro · Mamiya 645 AF 150mm f/3.5 · Mamiya 645 AF 210mm f/4

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.