50–120 Sigma 50-120mm F2.8 DC OS
The Sigma 50-120mm F2.8 DC OS is a zoom lens for Fujifilm X (APS-C) that covers 50-120 mm at f/2.8, weighs 390 g and focuses as close as 0.23 m at 50 mm, 0.55 m at 120 mm. Shortest reach (120 mm) of the 5 APS-C Fujifilm X zoom lenses in its focal range. Among them, it suits you if you carry it all day or travel light, or you shoot in low light or want a blurrier background. If you want more reach at the long end, each other one that does better on reach gives up at least one of weight and brightness.
- f/2.8widest aperture
- 390 gweight
- 35bodies it fits
Where it sits
3 lensesAPS-C Fujifilm X zoom lenses in its focal range that state each value, this one included. Each tick is one; the thick one is this one.
- Weight3 state it390 g
390 g, Sigma 50-120mm F2.8 DC OS995 g, Fujifilm XF 50-140mm F2.8 R LM OIS WR
- Filter thread3 state it55 mm
55 mm, Sigma 50-120mm F2.8 DC OS72 mm, Fujifilm XF 50-140mm F2.8 R LM OIS WR
Bodies it fits
35 bodies- Fits
APS-C bodies
- Fujifilm X-A1
- Fujifilm X-A10
- Fujifilm X-A2
- Fujifilm X-A3
- Fujifilm X-A5
- Fujifilm X-A7
- Fujifilm X-E1
- Fujifilm X-E2
- Fujifilm X-E2S
- Fujifilm X-E3
- Fujifilm X-E4
- Fujifilm X-E5
- Fujifilm X-H1
- Fujifilm X-H2
- Fujifilm X-H2S
- Fujifilm X-M1
- Fujifilm X-M5
- Fujifilm X-Pro1
- Fujifilm X-Pro2
- Fujifilm X-Pro3
- Fujifilm X-S10
- Fujifilm X-S20
- Fujifilm X-T1
- Fujifilm X-T10
- Fujifilm X-T100
- Fujifilm X-T2
- Fujifilm X-T20
- Fujifilm X-T200
- Fujifilm X-T3
- Fujifilm X-T30
- Fujifilm X-T30 II
- Fujifilm X-T30 III
- Fujifilm X-T4
- Fujifilm X-T5
- Fujifilm X-T50
Specifications
- Focal length
- 50-120 mm
- Widest aperture
- f/2.8
- Closest focus
- 0.23 m at 50 mm, 0.55 m at 120 mm1
- Maximum magnification
- 0.333x at 50 mm, 0.213x at 120 mm1
- Stabilization
- Yes
- Mount
- Fujifilm X1
- Covers
- APS-C
- Type
- Zoom
- Weight
- 390 g1
- Length
- 99.3 mm1
- Diameter
- 66.8 mm1
- Filter thread
- 55 mm1
- Elements
- 181
- Groups
- 131
- Aperture blades
- 111
- Hood
- LH585-011
Sources
- SIGMA lens specifications (sigma-global.com), checked Oct 15, 2026
Worked out by code, not stated by a source
- Focal length and widest aperture as the lens's own name states them.
- Read from the lens name: each maker marks the sensor size a lens covers (Sony FE/E, Canon RF/RF-S, Nikon DX, Tamron Di III/Di III-A, Sigma DG/DC); every Fujifilm X lens is APS-C and every Micro Four Thirds lens is Four Thirds.
- Read from the lens name: Sony marks optically stabilized lenses OSS, Canon IS, Nikon VR, Fujifilm OIS, Panasonic O.I.S., Tamron VC and Sigma OS; a lens from these makers without the mark has no optical stabilization.
- Prime or zoom, read from the focal length in the lens name.
Each value is checked automatically against the source it links, on the date shown. How we build these pages
† The makers' own tables, row by row, with labels in our plain words (translated where the maker's page isn't in English); each row's numbers are checked against the page it links.
Full specifications†
Show all 12 rows
| Full specifications | Sigma 50-120mm F2.8 DC OS1 |
|---|---|
| Lens mount type | FUJIFILM X Mount |
| Compatible sensor format | APS-C [DC] |
| Optical element configuration | 18 elements in 13 groups (1 FLD, 3 SLD, 4 aspherical elements) |
| Field of view range | 31.7°-13.5° (FUJIFILM X Mount) |
| Aperture blade count | 11 (rounded diaphragm) |
| Smallest aperture setting | F22 |
| Closest focus distance | 23cm(W) - 55cm(T) / 9.1in.(W) - 21.7in.(T) |
| Highest magnification ratio | 1:3(W) - 1:4.7(T) |
| Filter thread diameter | φ55mm |
| Physical size | φ66.8mm x 99.3mm / φ2.6in. x 3.9in. (FUJIFILM X Mount) |
| Lens mass | 390g / 13.8oz. (FUJIFILM X Mount) |
| Release edition code | C026 |
How the pick works
- Widest aperture3
Lower wins once they are 0.3 apart.
- Weight2
Lower wins from a 12% gap.
- Focal length (longest)2
Higher wins from a 15% gap.
- Focal length (widest)2
Lower wins once they are 2 mm apart.
- Optical stabilization1
Having it wins.
- Closest focus, wide end1
Lower wins from a 15% gap. Compared only between lenses of the same focal length (widest).
- Filter thread0.5
Lower wins once they are 5 mm apart.
- Lead for a pick1
Our pick or our take adds up the importance of each real difference, with these importances and thresholds: a gap smaller than its row's threshold is too close to call and counts as the same. They are our editorial choice, not a measurement, the same on every page, and they never read prices, sales or who sells it.
Paid placements0