Sigma 100-400mm f/5-6.3 DG DN OS vs Sony FE 70-300mm f/4.5-5.6 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 2026-09-01 · Sony E mount · prices change — check the retailer

Spec	Sigma 100-400mm f/5-6.3 DG DN OS	Sony FE 70-300mm f/4.5-5.6 G OSS
Focal length	100-400mm	70-300mm
Max aperture	f/5-6.3	f/4.5-5.6
Type	zoom	zoom
Coverage	full-frame	full-frame
Mount	Sony E	Sony E

Which should you buy?

the Sony FE 70-300mm f/4.5-5.6 G OSS opens wider (f/4.5-5.6) — 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 FE 70-300mm f/4.5-5.6 G OSS covers 70-300mm — pick the range that matches what you shoot
the Sony FE 70-300mm f/4.5-5.6 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

Sigma 100-400mm F5-6.3 Contemporary DG DN OS for Sony E Mount

Sigma 100-400mm f/5-6.3 DG DN OSSee price on Amazon

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Sony FE 70-300mm f/4.5-.6 G OSS Lens for E

Sony FE 70-300mm f/4.5-5.6 G OSSSee 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 FE 70-300mm f/4.5-5.6 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 FE 70-300mm f/4.5-5.6 G OSS is 70-300mm f/4.5-5.6 zoom, full-frame. 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 FE 70-300mm f/4.5-5.6 G OSS?
The Sony FE 70-300mm f/4.5-5.6 G OSS — its f/4.5-5.6 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 FE 70-300mm f/4.5-5.6 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).

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

More Sony E comparisons: Sony FE 50mm f/1.4 GM vs Sony FE 85mm f/1.4 GM II · Sigma 100-400mm f/5-6.3 DG DN OS vs Tamron 150-500mm f/5-6.7 Di III VC VXD · Sigma 100-400mm f/5-6.3 DG DN OS vs Sony E 55-210mm f/4.5-6.3 OSS · Sigma 14-24mm f/2.8 DG DN Art vs Sony FE 12-24mm f/4 G · all Sony E lenses · all comparisons

Sigma 100-400mm f/5-6.3 DG DN OSAffiliate linkSee price on Amazon