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

X-Fujinon 50mm f/1.9

Fuji Photo Film · Fujica X · 1980

single source, unconfirmed

Also known as: X-Fujinon 50mm f/1.9 · X-Fujinon 50mm f/1.9 FM · X-Fujinon 50mm f/1.9 DM · X-FUJINON 1:1.9 f=50mm FM · X-FUJINON 1:1.9 f=50mm DM · Fuji X-Fujinon 50mm 1.9 · Fujica STX 50mm f1.9 · Xフジノン 50mm F1.9 · X-FUJINON 50mm F1.9

Variants & identification

Variant Mount Years Serial ranges Production
X-Fujinon 50mm f/1.9 FM (no program coupling; STX-1 / STX-2 / AX-3 kit lens) Fujica X 1980–1985 — —
X-Fujinon 50mm f/1.9 DM (with program coupling) Fujica X 1980–1985 — —
  1. Construction. Fuji's table as read by Wikipedia and allphotolenses give five elements in five groups; japb, from the lens in hand, gives four in four. Neither the launch brochure nor the AX-3 manual lists the lens, so the primary table has not been seen here. Five in five is entered with the disagreement left open.
  2. Weight and length. 150 g and 37 mm in the table; japb measured 148 g and 37.0 mm; allphotolenses says 150 g and 35 mm. The table figures are used.
  3. Blades. Five, rounded, on japb; five on allphotolenses.
  4. Dates. The lens is absent from Fuji's 1979–80 brochure and from the AX-3 manual read here, which is consistent with japb's ≈1980 start and with cjo.info's note that the 55mm launch lenses were soon replaced by 50mm ones. 1980 is entered; nothing earlier is supported.
  5. An X-Fujinon 50mm f/2.2 (4/4, 145 g) also appears in Wikipedia's table as a later budget standard lens; it is not covered by this catalogue's wave and is not entered.
  6. Dutch Thrift is a dealer's blog and its review is marked as such; no launch price has been found in any source read.
How to tell them apart (expand)
  • Fujica X bayonet; 49 mm filter; 0.6 m close focus; f/16 minimum; five rounded blades; no EBC; 37 mm long
  • FM has no orange diamond and no button; DM has both. Everything else the same
  • Built to a price: plastic construction that the MFlenses posters and the STX-2 reviewers all mention

X-Fujinon 50mm f/1.9 FM (no program coupling; STX-1 / STX-2 / AX-3 kit lens):

  • X-FUJINON 1:1.9 f=50mm FM on the name ring; no orange diamond on the aperture scale and no push button: full-aperture metering and aperture-priority AE on an AX body, no program or shutter-priority (AX-5 manual; japb)
  • No EBC on any example; japb says the coating may lag the rest of the line
  • Five rounded blades, 148 g, 37.0 mm long, 60.6 mm across on japb's measured example

X-Fujinon 50mm f/1.9 DM (with program coupling):

  • X-FUJINON 1:1.9 f=50mm DM on the name ring; orange diamond past f/16 with the push-button lock, which sets the AX-5 and AX Multi Program to program or shutter-priority
  • Same construction, dimensions and weight as the FM lens in Fuji's table (5/5, 62×37 mm, 150 g, 49 mm)

Specifications

Formula
5 elements in 5 groups by Fuji's table as read by Wikipedia; japb counts 4 in 4 on the FM lens it measured (see table notes)
Construction
5 elements / 5 groups
Aperture range
f/1.9–f/16
Diaphragm blades
5
Min. focus
0.6 m
Dimensions
62 × 37 mm
Weight
150 g
Filter
49 mm
Years manufactured
1980–1985
Country
Japan
Coating
single-coated; never EBC

What reviewers say

Optical Ratings

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

Spherical aberration
soft wide open

History

The X-Fujinon 50mm f/1.9 is the cheapest standard lens of Fuji’s X-bayonet years and the one most STX-1, STX-1N and STX-2 bodies were sold with. It is not in Fuji’s launch brochure of 1979–80, which gives the STX-1 the 55mm f/2.2 as its standard lens; it replaced that lens once Fuji moved its normal lenses from 55mm to 50mm, and it stayed to the end of the mount in 1985. Fuji’s table gives five elements in five groups, 0.6m close focus, f/16, a 49mm filter, 62 by 37mm and 150g; japb, with an FM lens on the bench, counted four elements and weighed 148g. Five rounded blades. No example carries EBC.

It came in two forms. The FM lens has a plain aperture ring ending at f/16 and gives full-aperture metering and aperture-priority automation on any X body; it was bundled with the STX-1 and AX-3 and is the common one. The DM lens adds the orange diamond position past f/16 with its push-button lock, which sets the AX-5 and AX Multi Program to program or shutter-priority, and was bundled with the bodies that could use it. Nothing else differs, and Fuji’s table gives both identical figures.

The reviewers split on it more sharply than on any other Fujinon here, and the split is between film and digital. arhphotographic and Keith Drysdale, shooting it on the bodies it came with, call it really sharp and up there with the big names; Drysdale says the lens is what the STX-2’s detractors leave out. The MFlenses poster who tested a DM lens on a digital body found it soft and hard to focus wide open, and another poster wrote the whole late X-Fujinon line off as built to a price point with cheap plastic and a visible drop in image quality beside the 55mm f/1.6 and f/1.8. japb takes the middle position: the budget end of the redesigned standard primes, with a coating that may lag the rest of the line, trading at five to thirty euros.

Buying one: it is the lens that comes attached to a cheap body, so buy the body and check the lens. Look at the plastic barrel for cracks and the aperture ring for slop, at the blades for oil, and confirm FM or DM on the name ring if program mode matters. The X bayonet died in 1985 and the 43.5mm flange distance means a mirrorless adapter needs its own stop-down ring and a DSLR adapter needs corrective glass; the price of a good adapter can exceed the price of the lens. Fuji’s own Mount Adapter X-S goes the other way, putting M42 Fujinons on an X body with stopped-down automation, which is how most X-body owners get a wider choice of glass. No launch price has been found in any source read.

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 X-Fujinon 50mm f/1.9? We'd love to feature it (with credit).

Live listings

Asking price, USD: a median of $60 across 32 fixed-price listings on 2026-09-20 (middle half $35–$100). First day tracked.

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

Show 76 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 2026-09-20. Links go to the shop or marketplace that carries the item.

Related: X-Fujinon 50mm f/1.6 · X-Fujinon 50mm f/1.2 DM · Fujinon 55mm f/2.2 · Fujinon 55mm f/1.8 · EBC Fujinon 35mm f/1.9

Sources (16)

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.