Sony FE 100mm f/2.8 STF GM OSS vs Sigma 90mm f/2.8 DG DN Contemporary

Both are Sony E mount primes for portrait — 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 100mm f/2.8 STF GM OSS	Sigma 90mm f/2.8 DG DN Contemporary
Focal length	100mm	90mm
Max aperture	f/2.8	f/2.8
Type	prime	prime
Coverage	full-frame	full-frame
Mount	Sony E	Sony E

Which should you buy?

the Sigma 90mm f/2.8 DG DN Contemporary (90mm) is wider — more in the frame for street and interiors; the Sony FE 100mm f/2.8 STF GM OSS (100mm) is tighter — more reach and compression for portraits
the Sony FE 100mm f/2.8 STF GM OSS is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Sigma 90mm f/2.8 DG DN Contemporary is third-party — usually the value pick

Where to buy

Sony SEL100F28GM 100mm f2.8 Medium-telephoto Fixed Prime Camera Lens, Black

Sony FE 100mm f/2.8 STF GM OSSSee price on Amazon

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Sigma 90mm f/2.8 DG DN ContemporarySee price on Amazon Amazon has no new-stock listing for this one right now — this button runs an Amazon search for it rather than opening a product page.

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FAQ

What's the difference between the Sony FE 100mm f/2.8 STF GM OSS and the Sigma 90mm f/2.8 DG DN Contemporary?
The Sony FE 100mm f/2.8 STF GM OSS is 100mm f/2.8 prime, full-frame; the Sigma 90mm f/2.8 DG DN Contemporary is 90mm f/2.8 prime, full-frame. Both fit the Sony E mount.

Do the Sony FE 100mm f/2.8 STF GM OSS and Sigma 90mm f/2.8 DG DN Contemporary 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: Tamron 17-70mm f/2.8 Di III-A VC RXD vs Sony E PZ 16-50mm f/3.5-5.6 OSS · Sony E 11mm f/1.8 vs Viltrox AF 20mm f/2.8 · Yongnuo YN 50mm f/1.8S DF DSM vs Yongnuo YN 35mm f/1.8S DA Art · Yongnuo YN 50mm f/1.8S II DF DSM vs Yongnuo YN 35mm f/1.8S DA Art · all Sony E lenses · all comparisons

Sony FE 100mm f/2.8 STF GM OSSAffiliate linkSee price on Amazon