Tamron 20-40mm f/2.8 Di III VXD vs Tamron 17-50mm f/4 Di III VXD
Both are Sony E mount zooms for wide-angle and everyday — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.
| Spec | Tamron 20-40mm f/2.8 Di III VXD | Tamron 17-50mm f/4 Di III VXD |
|---|---|---|
| Focal length | 20-40mm | 17-50mm |
| Max aperture | f/2.8 | f/4 |
| Type | zoom | zoom |
| Coverage | full-frame | full-frame |
| Mount | Sony E | Sony E |
Which should you buy?
- the Tamron 20-40mm f/2.8 Di III VXD opens wider (f/2.8) — brighter in low light and more background blur
- the Tamron 20-40mm f/2.8 Di III VXD covers 20-40mm and the Tamron 17-50mm f/4 Di III VXD covers 17-50mm — pick the range that matches what you shoot
Where to buy
Tamron 20-40mm f/2.8 Di III VXDSee price on Amazon
Tamron 17-50mm f/4 Di III VXDSee price on Amazon
FAQ
What's the difference between the Tamron 20-40mm f/2.8 Di III VXD and the Tamron 17-50mm f/4 Di III VXD?
The Tamron 20-40mm f/2.8 Di III VXD is 20-40mm f/2.8 zoom, full-frame; the Tamron 17-50mm f/4 Di III VXD is 17-50mm f/4 zoom, full-frame. Both fit the Sony E mount.
Which is better in low light, the Tamron 20-40mm f/2.8 Di III VXD or the Tamron 17-50mm f/4 Di III VXD?
The Tamron 20-40mm f/2.8 Di III VXD — its f/2.8 maximum aperture lets in more light and gives more background blur than the f/4 of the other.
Do the Tamron 20-40mm f/2.8 Di III VXD and Tamron 17-50mm f/4 Di III VXD fit the same camera?
Yes — both are Sony E mount lenses, so they fit Sony a7/a9/a1 (full-frame) and a6000-series (APS-C).
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