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

Mamiya 645 AF 120mm f/4 Macro

Mamiya · Mamiya 645 AF · 2000

single source, unconfirmed our own finding

Also known as: Mamiya MF 120mm f/4 · Mamiya Macro MF 120mm f/4 · Mamiya 645AF 120mm f4 Macro · Mamiya 645 AF 120mm f/4 Macro · Mamiya Sekor Macro MF 120mm F4 · Mamiya Macro MF 120mm f/4 D · Mamiya 120mm f4 Macro MF D · Mamiya AF 120mm f/4 Macro D · Phase One 120mm f/4 Macro · マミヤ マクロ MF 120mm F4 · マミヤ645AF 120mm F4 マクロ · マミヤ AF 120mm F4 D マクロ

Variants & identification

Variant Mount Years Serial ranges Production
Mamiya MF 120mm f/4 Macro (manual focus, original) Mamiya 645 AF 2000 — —
Mamiya Sekor Macro MF 120mm f/4 D Mamiya 645 AF — — —
Mamiya AF 120mm f/4 Macro D (autofocus) Mamiya 645 AF — — —
  1. Element count, angle of view, closest focus, magnification, filter size and weight for the original are from Mamiya's 645AF Interchangeable Lenses instruction sheet (cameramanuals.org); its dimension cell is illegible in the scan. The D lenses' figures come only from the Wikipedia lens table.
  2. Weight: Mamiya's sheet prints 845 g for the original; Wikipedia gives 835 g for the MF D and 960 g for the AF D.
  3. The 2000 first year is inferred, not sourced: the lens is missing from Mamiya's launch-era sheet and present on the later one, and Mamiya America's spring 2000 brochure counts nine lenses available. See original_research.
  4. No source consulted gives the aperture blade count, a list price, or the years of the D versions; the MF D is on camera-wiki's autumn 2008 list, the AF D is not.
How to tell them apart (expand)
  • MF or AF before the focal length is the first split: the original and the MF D are manual-focus lenses with a wide focusing ring and MAG scale; the AF D is the only autofocus version
  • All three are 9 elements in 8 groups, f/4, 67 mm filter; the manual lenses focus to 0.40 m at life size, the AF D to 0.37 m (Mamiya sheet; Wikipedia table)
  • None has an aperture ring, unlike the manual-focus Macro C 120mm f/4 of the M645 mount

Mamiya MF 120mm f/4 Macro (manual focus, original):

  • Name ring reads MF 120mm f/4, not AF: a manual-focus lens in the AF mount, with electronic contacts for automatic diaphragm and focus confirmation but no autofocus coupling (Mamiya instruction sheet)
  • Mamiya's instruction sheet: 9 elements in 8 groups, 33° angle of view, f/32 minimum, 0.40 m closest focus, 1.00× (life size) magnification, 67 mm filter, bayonet hood, 845 g
  • MAG scale on the barrel giving reciprocal magnification (20 = 1/20, 1 = life size); the wide focusing ring covers most of the barrel
  • Mamiya's sheet says to focus it manually until the focus mark lights on the body's display

Mamiya Sekor Macro MF 120mm f/4 D:

  • D after the aperture on the name ring; still MF, still manual focus (camera-wiki: manual focus only)
  • Wikipedia's lens table gives the D 9 elements in 8 groups, 0.40 m, 67 mm filter and 835 g against Mamiya's 845 g for the original

Mamiya AF 120mm f/4 Macro D (autofocus):

  • AF rather than MF on the name ring, with D after the aperture
  • Wikipedia's lens table: 9 elements in 8 groups, 0.37 m closest focus, 67 mm filter, 960 g, so heavier than the manual lens and focusing a little closer

Specifications

Formula
9 elements in 8 groups (Mamiya 645AF Interchangeable Lenses instruction sheet)
Construction
9 elements / 8 groups
Aperture range
f/4–f/32
Min. focus
0.4 m
Weight
845 g
Filter
67 mm
Years manufactured
2000
Country
Japan
Coating
Multicoated: Mamiya America's 2000 lens brochure describes every element as coated with Mamiya's proprietary multicoating; the D lenses carry coatings redesigned for digital sensors (dpreview, 2015)

What reviewers say

Optical Ratings

Aggregated from the reviews above — follow the links for the full picture.

Chromatic aberration
colour fringing close-up

History

The 120mm f/4 macro is the odd lens of the Mamiya 645 AF line: for most of its life it was a manual-focus lens in an autofocus mount, engraved MF 120mm f/4, with electronic contacts for the automatic diaphragm and the body’s focus confirmation but no focus coupling. Mamiya’s instruction sheet gives nine elements in eight groups, 33° angle of view, f/32 minimum, 0.40 m closest focus at life size with no extension, a 67 mm filter thread, a bayonet hood and 845 g, and tells the user to focus it by hand until the focus mark lights in the finder. A MAG scale on the barrel reads reciprocal magnification, 20 for 1/20 and 1 for life size. It is a different lens from the manual-focus Macro C 120mm f/4 of the M645 mount, which has an aperture ring and no electronics.

The lens is not on Mamiya’s launch-era 645AF lens sheet, which lists five autofocus lenses, and appears on the later sheet with the 35mm, 150mm and the zooms; Mamiya America’s spring 2000 brochure counts nine lenses then available, so the catalog gives 2000 and marks it as inference. Three versions exist. The original MF 120mm f/4 gave way to the Sekor Macro MF 120mm f/4 D, still manual focus, which is on camera-wiki’s autumn 2008 list and which Wikipedia tabulates at 835 g with the same optics and closest focus. The AF 120mm f/4 Macro D of the Phase One era is the only autofocus version: Wikipedia gives it 9 elements in 8 groups, 0.37 m and 960 g, and no other source consulted describes it, so whether it is the same optical design with a focus motor coupling or a fresh computation is unknown. Wikipedia glosses D as optimised for digital sensors, and Damien Demolder’s 2015 field test says the Phase One-era lenses have redesigned coatings and an adjusted exit light path.

The reviews are strong. Tony Howell, testing the manual-focus lens on a Phase One 645AF with a 39-megapixel back, found it good wide open, excellent in the centre and all four corners, best at f/8 and softened by diffraction at f/22, and gave it 10 out of 10 as the best Mamiya or Phase One lens he had used, for landscapes as much as macro. Michael Reichmann counted the 120mm macro among the Mamiya lenses that all performed very well on the Phase One 645 in 2009. Demolder’s one reservation, on the 645DF+ in 2015, was the bokeh at close range, with multi-coloured veins and glowing green edges in the out-of-focus areas; the lens he used is not identified as MF or AF.

When buying, decide first whether the lens is MF or AF, since sellers write 645AF on all three. On the manual versions turn the wide focusing ring through its full travel to life size and confirm that the body’s focus mark lights and that the diaphragm stops down automatically; on the AF D confirm that the body drives it. Check the rear electronic contacts for corrosion. The Schneider-Kreuznach 120mm f/4 LS Macro and the 120mm f/5.6 tilt-shift for the 645DF are different lenses.

What remains open: Mamiya’s dimension figures for the manual lens, the aperture blade count, list prices, the years of both D versions, and the optical relationship of the AF D to the manual lens.

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 wanted — shot with a Mamiya 645 AF 120mm f/4 Macro? We'd love to feature it (with credit).

Live listings

Asking price, USD: a median of $500 across 4 fixed-price listings on 2026-09-21 (middle half $340–$530). First day tracked.

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

Show 6 more listings

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 45mm f/2.8 · Mamiya 645 AF 80mm f/2.8 · Mamiya 645 AF 150mm f/3.5 · Mamiya 645 AF 210mm f/4

Sources (10)

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.