Tamron 70-180mm f/2.8 Di III VXD G2 vs Sony FE 100-400mm f/4.5 GM OSS

Both are Sony E mount zooms for telephoto and sports & action — 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 70-180mm f/2.8 Di III VXD G2	Sony FE 100-400mm f/4.5 GM OSS
Focal length	70-180mm	100-400mm
Max aperture	f/2.8	f/4.5
Type	zoom	zoom
Coverage	full-frame	full-frame
Mount	Sony E	Sony E

Which should you buy?

the Tamron 70-180mm f/2.8 Di III VXD G2 opens wider (f/2.8) — brighter in low light and more background blur
the Tamron 70-180mm f/2.8 Di III VXD G2 covers 70-180mm and the Sony FE 100-400mm f/4.5 GM OSS covers 100-400mm — pick the range that matches what you shoot
the Sony FE 100-400mm f/4.5 GM OSS is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Tamron 70-180mm f/2.8 Di III VXD G2 is third-party — usually the value pick

Where to buy

Tamron 70-180mm F/2.8 Di III VC VXD G2 for Sony E-Mount Full Frame Mirrorless Cameras

Tamron 70-180mm f/2.8 Di III VXD G2See price on Amazon

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Sony FE 100-400mm f/4.5 GM OSSSee price on Amazon

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FAQ

What's the difference between the Tamron 70-180mm f/2.8 Di III VXD G2 and the Sony FE 100-400mm f/4.5 GM OSS?
The Tamron 70-180mm f/2.8 Di III VXD G2 is 70-180mm f/2.8 zoom, full-frame; the Sony FE 100-400mm f/4.5 GM OSS is 100-400mm f/4.5 zoom, full-frame. Both fit the Sony E mount.

Which is better in low light, the Tamron 70-180mm f/2.8 Di III VXD G2 or the Sony FE 100-400mm f/4.5 GM OSS?
The Tamron 70-180mm f/2.8 Di III VXD G2 — its f/2.8 maximum aperture lets in more light and gives more background blur than the f/4.5 of the other.

Do the Tamron 70-180mm f/2.8 Di III VXD G2 and Sony FE 100-400mm f/4.5 GM 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).

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

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Tamron 70-180mm f/2.8 Di III VXD G2Affiliate linkSee price on Amazon