Sony FE 28-70mm f/2 GM vs Sigma 17-40mm f/1.8 DC Art

Both are Sony E mount zooms for pro standard zoom and low-light — 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 28-70mm f/2 GM	Sigma 17-40mm f/1.8 DC Art
Focal length	28-70mm	17-40mm
Max aperture	f/2	f/1.8
Type	zoom	zoom
Coverage	full-frame	APS-C
Mount	Sony E	Sony E

Which should you buy?

the Sigma 17-40mm f/1.8 DC Art opens wider (f/1.8) — brighter in low light and more background blur
the Sony FE 28-70mm f/2 GM covers 28-70mm and the Sigma 17-40mm f/1.8 DC Art covers 17-40mm — pick the range that matches what you shoot
the Sony FE 28-70mm f/2 GM covers full-frame (also works on APS-C bodies); the Sigma 17-40mm f/1.8 DC Art is APS-C-only — it won't fill a full-frame sensor
the Sony FE 28-70mm f/2 GM is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Sigma 17-40mm f/1.8 DC Art is third-party — usually the value pick

Where to buy

Sony FE 28-70mm F2 GM Lens, G Master Standard Zoom Lens (Black)

Check the Sony FE 28-70mm f/2 GM price on Amazon →

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Sigma 17-40mm F1.8 DC | Art for Sony E, Black

Check the Sigma 17-40mm f/1.8 DC Art price on Amazon →

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FAQ

What's the difference between the Sony FE 28-70mm f/2 GM and the Sigma 17-40mm f/1.8 DC Art?
The Sony FE 28-70mm f/2 GM is 28-70mm f/2 zoom, full-frame; the Sigma 17-40mm f/1.8 DC Art is 17-40mm f/1.8 zoom, APS-C. Both fit the Sony E mount.

Which is better in low light, the Sony FE 28-70mm f/2 GM or the Sigma 17-40mm f/1.8 DC Art?
The Sigma 17-40mm f/1.8 DC Art — its f/1.8 maximum aperture lets in more light and gives more background blur than the f/2 of the other.

Do the Sony FE 28-70mm f/2 GM and Sigma 17-40mm f/1.8 DC Art 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 Sigma 17-40mm f/1.8 DC Art is APS-C-only and won't fill a full-frame sensor.

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

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