Sony FE 400-800mm f/6.3-8 G OSS vs Sigma 300-600mm f/4 DG OS Sports

Both are Sony E mount zooms for wildlife 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 400-800mm f/6.3-8 G OSS	Sigma 300-600mm f/4 DG OS Sports
Focal length	400-800mm	300-600mm
Max aperture	f/6.3-8	f/4
Type	zoom	zoom
Coverage	full-frame	full-frame
Mount	Sony E	Sony E

Which should you buy?

the Sigma 300-600mm f/4 DG OS Sports opens wider (f/4) — brighter in low light and more background blur
the Sony FE 400-800mm f/6.3-8 G OSS covers 400-800mm and the Sigma 300-600mm f/4 DG OS Sports covers 300-600mm — pick the range that matches what you shoot
the Sony FE 400-800mm f/6.3-8 G OSS is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Sigma 300-600mm f/4 DG OS Sports is third-party — usually the value pick

Where to buy

Sony FE 400-800mm f/6.3-8 G OSSSee price on Amazon

Amazon links are affiliate links — we may earn a commission at no extra cost to you.

Sigma 300-600mm f/4 DG OS SportsSee price on Amazon

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate links never affect our specs or which lenses we compare.

FAQ

What's the difference between the Sony FE 400-800mm f/6.3-8 G OSS and the Sigma 300-600mm f/4 DG OS Sports?
The Sony FE 400-800mm f/6.3-8 G OSS is 400-800mm f/6.3-8 zoom, full-frame; the Sigma 300-600mm f/4 DG OS Sports is 300-600mm f/4 zoom, full-frame. Both fit the Sony E mount.

Which is better in low light, the Sony FE 400-800mm f/6.3-8 G OSS or the Sigma 300-600mm f/4 DG OS Sports?
The Sigma 300-600mm f/4 DG OS Sports — its f/4 maximum aperture lets in more light and gives more background blur than the f/6.3-8 of the other.

Do the Sony FE 400-800mm f/6.3-8 G OSS and Sigma 300-600mm f/4 DG OS Sports 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 100-400mm f/5-6.3 DG DN OS vs Tamron 150-500mm f/5-6.7 Di III VC VXD · Sony E 11mm f/1.8 vs Viltrox AF 13mm f/1.4 · Sony FE 28mm f/2 vs Yongnuo YN 35mm f/1.8S DA DSM WL · Sony FE 85mm f/1.4 GM vs Sigma 85mm f/1.2 DG Art · all Sony E lenses · all comparisons

Sony FE 400-800mm f/6.3-8 G OSSAffiliate linkSee price on Amazon