Mamiya Sekor Zoom AF 45-90mm f/4.5 D Aspherical
Mamiya · Mamiya 645 AF · 2008
single source, unconfirmedAlso known as: Mamiya Sekor Zoom AF 45-90mm f/4.5 D Aspherical · Mamiya 45-90mm f4.5 D Aspherical · Mamiya AF 45-90mm F4.5 D · Mamiya 645 AF 45-90mm f/4.5 · Mamiya 645AFD 45-90mm · Mamiya Sekor D 45-90mm · Phase One 45-90mm f/4.5 AF · Phase One AF 45-90mm f4.5 · マミヤ セコールズーム AF 45-90mm F4.5 D Aspherical · マミヤ AF 45-90mm F4.5 D · マミヤ645AF 45-90mm
Variants & identification
| Variant | Mount | Years | Serial ranges | Production |
|---|---|---|---|---|
| Mamiya Sekor Zoom AF 45-90mm f/4.5 D Aspherical | Mamiya 645 AF | 2008 | — | — |
- Closest focus (50 cm), magnification (0.24×), filter thread (77 mm), dimensions (86 mm maximum diameter × 110 mm length), weight (910 g), hood and price are from dc.watch's PIE2008 report of 20 March 2008. The construction, 13 elements in 11 groups, and the 0.5 m and φ77 figures are from the Japanese Wikipedia product list, the only source consulted that gives the element count; the page therefore carries the single-source flag for the formula. Search-result summaries of a Lenstip specification page gave 13 elements in 10 groups and about 910 g, but that page could not be read.
- Price: ¥504,000 as announced in March 2008, tax included, with the release date then undecided. The lens is absent from the November 2009 open-pricing list, so no later price is known; no dollar list price was found.
- The year 2008 is the announcement year. No source consulted gives a shipping date, a production run or a discontinuation date, and the lens is absent from camera-wiki's autumn 2008 list and from Mamiya Leaf's 2014 page.
- The aperture blade count and the minimum aperture are not given by dc.watch or Japanese Wikipedia; f/32 is the minimum of every other 645 AF zoom but is not asserted here.
How to tell them apart
- Sekor Zoom AF 45-90mm f/4.5 D Aspherical on the ring, 77 mm thread, petal hood, sliding distance ring for AF/MF, no aperture ring
- About 110 mm long, 86 mm across and 910 g, focusing to 50 cm (dc.watch); no manual-focus 45-90 exists in the M645 line, so the only look-alike risk is the Hasselblad HC 35-90 or Contax 645 45-90, which are other mounts
Mamiya Sekor Zoom AF 45-90mm f/4.5 D Aspherical:
- Sekor Zoom AF 45-90mm f/4.5 D Aspherical on the name ring; petal hood; 77 mm filter thread; autofocus and manual focus switched by sliding the distance ring (dc.watch, March 2008)
- dc.watch's PIE2008 figures: 50 cm closest focus, 0.24× magnification, 86 mm maximum diameter, 110 mm long, 910 g; a 28–56mm equivalent on 645 film
- The only 645 AF zoom that reaches 45mm; the 55-110mm f/4.5 starts at 55mm, takes 67 mm filters and focuses to 1.5 m
- Mamiya Sekor Zoom AF 45-90mm f/4.5 D Aspherical: Announced at PIE2008 in March 2008 with the 645AFD III, the Sekor AF 80mm f/2.8 D and the Sekor AF 150mm f/2.8 IF D, at ¥504,000 with the release date undecided (dc.watch, 20 March 2008). Unlike the other two lenses it is missing from Mamiya's November 2009 list of Sekor D lenses moved to open pricing and from Mamiya Leaf's 2014 lens page, and camera-wiki's autumn 2008 list does not have it; the Japanese Wikipedia product list is the only source consulted that tabulates it, with 13 elements in 11 groups. Whether and when it shipped in Japan is not settled by any source consulted.
Specifications
- Formula
- 13 elements in 11 groups with aspherical surfaces (Japanese Wikipedia product list; dc.watch prints no construction)
- Construction
- 13 elements / 11 groups
- Aperture range
- f/4.5
- Min. focus
- 0.5 m
- Dimensions
- 86 × 110 mm
- Weight
- 910 g
- Filter
- 77 mm
- Years manufactured
- 2008
- Country
- Japan
- Coating
- Multicoated; Mamiya America's lens brochure says every element is coated with Mamiya's proprietary multi-coating process, and Damien Demolder's 2015 field test says the D-era lenses carry coatings and an exit light path reworked for digital sensors (dpreview, cited on the AF 80mm page)
- Original price
- ¥504,000 (announced March 2008, tax included; release date then undecided) (today ¥565,000)
What reviewers say
No reviews aggregated yet — this family is still in the research queue. Written one? We'd love to index it.
History
The Sekor Zoom AF 45-90mm f/4.5 D Aspherical is the wide-to-normal zoom of Mamiya’s Sekor D series, a 28–56mm equivalent on 6×4.5 film and the only zoom for the 645 AF bayonet that reaches 45mm. Mamiya Digital Imaging announced it at PIE2008 in March 2008 in the same breath as the 645AFD III film body, the Sekor AF 80mm f/2.8 D and the Sekor AF 150mm f/2.8 IF D, with a price of ¥504,000 and a release date still undecided. dc.watch’s report gives 50 cm closest focus for 0.24×, a 77 mm filter thread, a petal hood, a barrel 110 mm long and 86 mm across, 910 g, and the sliding distance ring that switches Mamiya’s telephotos and zooms between autofocus and manual focus; the Japanese Wikipedia product list adds 13 elements in 11 groups with aspherical surfaces.
Its later history is thin. The 80mm D and 150mm D that were announced with it went on sale on 21 April 2008 and reappear on Mamiya’s November 2009 list of Sekor D lenses moved to open pricing; the 45-90 does not, nor is it on camera-wiki’s autumn 2008 list of lenses available, nor on Mamiya Leaf’s 2014 lens page, which carries the 75-150 D and the 105-210 but no 45-90. The Japanese Wikipedia product list is the only source consulted that tabulates it, and the page carries the single-source flag for that reason. Phase One’s name for it, where it appears, is the Phase One 45-90mm f/4.5 AF. No source consulted settles whether it shipped in Japan at the announced price, in what numbers, or when it was dropped, and examples are rare on the used market.
No review or test of the lens was found. What the maker’s figures say is that it is a 2× zoom of ordinary speed that focuses unusually close for a medium-format zoom, half a metre against 1.5 m for the 55-110 and 1 m for the 75-150 D.
When buying, check the rear electronic contacts, that the distance ring slides cleanly between its two positions, that zoom and focus rings run without stiffness, that the body reports the lens and drives it to 50 cm, and that the petal hood is present. Older bodies are a concern: an original 645AF needs factory conversion and an early AFD a software update before the D lenses report their aperture.
What remains open: the shipping date, the minimum aperture and blade count, a second source for the construction, a dollar list price, and a discontinuation date.
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 Sekor Zoom AF 45-90mm f/4.5 D Aspherical? We'd love to feature it (with credit).
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