Fujifilm X-Mount
Tamron 17-70mm F2.8 Di III-A VC RXD vs Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount
Two APS-C zooms for Fujifilm X with constant f/2.8. The Tamron 17-70mm f/2.8 Di III-A VC RXD (market launch July 2022) runs from 17 to 70 mm (about 26 to 105 mm in full-frame terms) and has optical image stabilization (VC). It weighs 530 g, is 119.6 mm long and takes 67 mm filters.
The Sigma 18-50mm f/2.8 DC DN Contemporary (market launch December 2022) ends at 50 mm (about 75 mm full-frame equivalent) and has no stabilization of its own. It weighs 285 g, is 76.8 mm long and takes 55 mm filters. The Sigma focuses from 12.1 cm at 18 mm (maximum magnification 1:2.8), the Tamron from 19 cm at 17 mm (1:4.8).
Key data at a glance
- Tamron 17-70mm: 17 to 70 mm, about 26 to 105 mm full-frame equivalent, stabilized, 530 g, 67 mm filters.
- Sigma 18-50mm: 18 to 50 mm, about 27 to 75 mm full-frame equivalent, no stabilizer, 285 g, 55 mm filters.
Key differences
- Focal length: 17-70 mm on the Tamron 17-70mm F2.8 Di III-A VC RXD, 18-50 mm on the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount.
- Full-frame equivalent (crop factor 1.5): 26-105 mm on the Tamron 17-70mm F2.8 Di III-A VC RXD, 27-75 mm on the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount.
- The Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount is 245 g lighter (285 g vs 530 g).
- The Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount is 43 mm shorter.
- The Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount is narrower: 61.6 mm instead of 74.6 mm in diameter.
- Filter thread: 67 mm on the Tamron 17-70mm F2.8 Di III-A VC RXD, 55 mm on the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount.
- The Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount focuses closer: from 12.1 cm instead of 19 cm.
- Maximum magnification: 1:2.8 on the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount, 1:4.8 on the Tamron 17-70mm F2.8 Di III-A VC RXD.
- Only the Tamron 17-70mm F2.8 Di III-A VC RXD has optical image stabilization.
- Market launch or announcement: July 2022 for the Tamron 17-70mm F2.8 Di III-A VC RXD, December 2022 for the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount.
Minimum focus distance by focal length
Manufacturer figures, measured from the sensor plane. On zooms the limit changes with the focal length.
- Tamron 17-70mm F2.8 Di III-A VC RXD
- 19 cm at 17 mm 路 39 cm at 70 mm
- Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount
- 12.1 cm at 18 mm 路 30 cm at 50 mm
Specs side by side
The key specs of both lenses side by side.
| Lens | Tamron 17-70mm F2.8 Di III-A VC RXD | Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount |
|---|---|---|
| Focal length | 17-70 mm | 18-50 mm |
| Max. aperture | f/2.8 | f/2.8 |
| Weight | 530 g | 285 g |
| Filter diameter | 67 mm | 55 mm |
| Min. focus distance | 19 cm | 12.1 cm |
| Length | 119.6 mm | 76.8 mm |
| Autofocus | yes | yes |
| Image stabilization | yes | no |
Size comparison
- 1 Tamron 17-70mm F2.8 Di III-A VC RXD 119.6 脳 74.6 mm 路 530 g
- 2 Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount 76.8 脳 61.6 mm 路 285 g
Schematic silhouettes. Length and diameter are manufacturer figures, drawn at the same scale for all lenses.
Open in the size comparisonFeatures named by the manufacturers
Features the manufacturer states explicitly.
Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount
- Weather protection
- Internal focusing
Compatible cameras
Both lenses fit Fujifilm X-Mount cameras. The database lists 36 bodies.
Camera list and adapters for the Tamron 17-70mm F2.8 Di III-A VC RXDCamera list and adapters for the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount
More lenses in this class
Fujifilm X-Mount lenses with a similar focal length and aperture to the two compared here.
- Fujifilm XF 18-55mm F2.8-4 R LM OIS 18-55 mm 路 f/2.8-4 Compare all threeFujifilm XF 18-55mm F2.8-4 R LM OIS
- Fujifilm XF 16-50mm F2.8-4.8 R LM WR 16-50 mm 路 f/2.8-4.8 Compare all threeFujifilm XF 16-50mm F2.8-4.8 R LM WR
- Tamron 16-50mm F2.8 A 16-50 mm 路 f/2.8 Compare all threeTamron 16-50mm F2.8 A
- Fujifilm XF 16-55mm F2.8 R LM WR 16-55 mm 路 f/2.8 Compare all threeFujifilm XF 16-55mm F2.8 R LM WR
Frequently asked questions about this comparison
Which is lighter, the Tamron 17-70mm F2.8 Di III-A VC RXD or the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount?
The Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount is lighter at 285 g than the Tamron 17-70mm F2.8 Di III-A VC RXD at 530 g, a difference of 245 g.
Which is faster, the Tamron 17-70mm F2.8 Di III-A VC RXD or the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount?
Both have the same maximum aperture: f/2.8.
What filter size do the Tamron 17-70mm F2.8 Di III-A VC RXD and the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount use?
The Tamron 17-70mm F2.8 Di III-A VC RXD takes 67 mm filters, the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount takes 55 mm.
Do the Tamron 17-70mm F2.8 Di III-A VC RXD and the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount have image stabilization?
Only the Tamron 17-70mm F2.8 Di III-A VC RXD has optical image stabilization.
Do the Tamron 17-70mm F2.8 Di III-A VC RXD and the Sigma 18-50mm F2.8 DC DN | C for Fujifilm X Mount fit the same cameras?
Yes, both fit Fujifilm X-Mount cameras.