Sony FE 100-400mm f/4.5-5.6 GM OSS vs Tamron 70-180mm f/2.8 Di III VXD G2

Both are Sony E mount zooms for sports & action and telephoto — 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	Sony FE 100-400mm f/4.5-5.6 GM OSS	Tamron 70-180mm f/2.8 Di III VXD G2
Focal length	100-400mm	70-180mm
Max aperture	f/4.5-5.6	f/2.8
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 Sony FE 100-400mm f/4.5-5.6 GM OSS covers 100-400mm and the Tamron 70-180mm f/2.8 Di III VXD G2 covers 70-180mm — pick the range that matches what you shoot
the Sony FE 100-400mm f/4.5-5.6 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

Sony FE 100-400mm f/4.5-5.6 GM OSSSee price on Amazon

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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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FAQ

What's the difference between the Sony FE 100-400mm f/4.5-5.6 GM OSS and the Tamron 70-180mm f/2.8 Di III VXD G2?
The Sony FE 100-400mm f/4.5-5.6 GM OSS is 100-400mm f/4.5-5.6 zoom, full-frame; the Tamron 70-180mm f/2.8 Di III VXD G2 is 70-180mm f/2.8 zoom, full-frame. Both fit the Sony E mount.

Which is better in low light, the Sony FE 100-400mm f/4.5-5.6 GM OSS or the Tamron 70-180mm f/2.8 Di III VXD G2?
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/4.5-5.6 of the other.

Do the Sony FE 100-400mm f/4.5-5.6 GM OSS and Tamron 70-180mm f/2.8 Di III VXD G2 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:

More Sony E comparisons: Sigma 35mm f/1.4 DG DN Art vs Sony FE 35mm f/1.4 GM · Sony FE 50mm f/1.4 GM vs Sony FE 85mm f/1.4 GM II · Sony FE 100-400mm f/4.5-5.6 GM OSS vs Sony FE 70-200mm f/4 G OSS · Sony FE 200-600mm f/5.6-6.3 G OSS vs Sony FE 70-200mm f/2.8 GM OSS II · all Sony E lenses · all comparisons

Sony FE 100-400mm f/4.5-5.6 GM OSSAffiliate linkSee price on Amazon