Tamron 20-40mm f/2.8 Di III VXD vs Sony E 10-18mm f/4 OSS

Both are Sony E mount zooms for wide-angle and travel — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.

Last verified 2026-09-01 · Sony E mount · prices change — check the retailer

Spec	Tamron 20-40mm f/2.8 Di III VXD	Sony E 10-18mm f/4 OSS
Focal length	20-40mm	10-18mm
Max aperture	f/2.8	f/4
Type	zoom	zoom
Coverage	full-frame	APS-C
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 Sony E 10-18mm f/4 OSS covers 10-18mm — pick the range that matches what you shoot
the Tamron 20-40mm f/2.8 Di III VXD covers full-frame (also works on APS-C bodies); the Sony E 10-18mm f/4 OSS is APS-C-only — it won't fill a full-frame sensor
the Sony E 10-18mm f/4 OSS is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Tamron 20-40mm f/2.8 Di III VXD is third-party — usually the value pick

Where to buy

Tamron 20-40mm f/2.8 Di III VXD Lens for Sony E-Mount Full Frame Mirrorless Cameras Black

Check the Tamron 20-40mm f/2.8 Di III VXD price on Amazon →

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Sony - E 10-18mm F4 OSS Wide-Angle Zoom Lens (SEL1018),Black

Check the Sony E 10-18mm f/4 OSS price on Amazon →

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FAQ

What's the difference between the Tamron 20-40mm f/2.8 Di III VXD and the Sony E 10-18mm f/4 OSS?
The Tamron 20-40mm f/2.8 Di III VXD is 20-40mm f/2.8 zoom, full-frame; the Sony E 10-18mm f/4 OSS is 10-18mm f/4 zoom, APS-C. Both fit the Sony E mount.

Which is better in low light, the Tamron 20-40mm f/2.8 Di III VXD or the Sony E 10-18mm f/4 OSS?
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 Sony E 10-18mm f/4 OSS 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). Note the Sony E 10-18mm f/4 OSS is APS-C-only and won't fill a full-frame sensor.

Citing these specs? Go ahead — manufacturer data, last verified 2026-09-01. Copy a ready-made reference:

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Tamron 20-40mm f/2.8 Di III VXDAffiliate linkAmazon →