Sigma 100-400mm f/5-6.3 DG DN OS vs Sony E 70-350mm f/4.5-6.3 G OSS

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 2026-06-21 · Sony E mount · prices change — check the retailer

Spec	Sigma 100-400mm f/5-6.3 DG DN OS	Sony E 70-350mm f/4.5-6.3 G OSS
Focal length	100-400mm	70-350mm
Max aperture	f/5-6.3	f/4.5-6.3
Type	zoom	zoom
Coverage	full-frame	APS-C
Mount	Sony E	Sony E

Which should you buy?

• the Sony E 70-350mm f/4.5-6.3 G OSS opens wider (f/4.5-6.3) — brighter in low light and more background blur
• the Sigma 100-400mm f/5-6.3 DG DN OS covers 100-400mm and the Sony E 70-350mm f/4.5-6.3 G OSS covers 70-350mm — pick the range that matches what you shoot
• the Sigma 100-400mm f/5-6.3 DG DN OS covers full-frame (also works on APS-C bodies); the Sony E 70-350mm f/4.5-6.3 G OSS is APS-C-only — it won't fill a full-frame sensor
• the Sony E 70-350mm f/4.5-6.3 G OSS is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Sigma 100-400mm f/5-6.3 DG DN OS is third-party — usually the value pick

Where to buy

Check the Sigma 100-400mm f/5-6.3 DG DN OS price on Amazon →

Check the Sony E 70-350mm f/4.5-6.3 G OSS price on Amazon →

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FAQ

What's the difference between the Sigma 100-400mm f/5-6.3 DG DN OS and the Sony E 70-350mm f/4.5-6.3 G OSS?
The Sigma 100-400mm f/5-6.3 DG DN OS is 100-400mm f/5-6.3 zoom, full-frame; the Sony E 70-350mm f/4.5-6.3 G OSS is 70-350mm f/4.5-6.3 zoom, APS-C. Both fit the Sony E mount.

Which is better in low light, the Sigma 100-400mm f/5-6.3 DG DN OS or the Sony E 70-350mm f/4.5-6.3 G OSS?
The Sony E 70-350mm f/4.5-6.3 G OSS — its f/4.5-6.3 maximum aperture lets in more light and gives more background blur than the f/5-6.3 of the other.

Do the Sigma 100-400mm f/5-6.3 DG DN OS and Sony E 70-350mm f/4.5-6.3 G 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 70-350mm f/4.5-6.3 G OSS is APS-C-only and won't fill a full-frame sensor.

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