Yongnuo YN 50mm f/1.8S DA DSM II vs Sigma 65mm f/2 DG DN Contemporary

Both are Sony E mount primes for standard prime and 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	Yongnuo YN 50mm f/1.8S DA DSM II	Sigma 65mm f/2 DG DN Contemporary
Focal length	50mm	65mm
Max aperture	f/1.8	f/2
Type	prime	prime
Coverage	APS-C	full-frame
Mount	Sony E	Sony E

Which should you buy?

the Yongnuo YN 50mm f/1.8S DA DSM II opens wider (f/1.8) — brighter in low light and more background blur
the Yongnuo YN 50mm f/1.8S DA DSM II (50mm) is wider — more in the frame for street and interiors; the Sigma 65mm f/2 DG DN Contemporary (65mm) is tighter — more reach and compression for portraits
the Sigma 65mm f/2 DG DN Contemporary covers full-frame (also works on APS-C bodies); the Yongnuo YN 50mm f/1.8S DA DSM II is APS-C-only — it won't fill a full-frame sensor

Where to buy

YONGNUO Upgraded YN50MM F1.8S DA DSM II Standard Prime Lens, Auto Focus F1.8 Large Aperture, APS-C Frame for Sony E-Moun

Yongnuo YN 50mm f/1.8S DA DSM IISee price on Amazon

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Sigma 65mm f/2 DG DN ContemporarySee price on Amazon

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FAQ

What's the difference between the Yongnuo YN 50mm f/1.8S DA DSM II and the Sigma 65mm f/2 DG DN Contemporary?
The Yongnuo YN 50mm f/1.8S DA DSM II is 50mm f/1.8 prime, APS-C; the Sigma 65mm f/2 DG DN Contemporary is 65mm f/2 prime, full-frame. Both fit the Sony E mount.

Which is better in low light, the Yongnuo YN 50mm f/1.8S DA DSM II or the Sigma 65mm f/2 DG DN Contemporary?
The Yongnuo YN 50mm f/1.8S DA DSM II — its f/1.8 maximum aperture lets in more light and gives more background blur than the f/2 of the other.

Do the Yongnuo YN 50mm f/1.8S DA DSM II and Sigma 65mm f/2 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). Note the Yongnuo YN 50mm f/1.8S DA DSM II 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:

More Sony E comparisons: Sigma 35mm f/1.4 DG DN Art vs Sony FE 35mm f/1.4 GM · Sony FE 50mm f/1.4 GM vs Sony FE 85mm f/1.4 GM II · Yongnuo YN 50mm f/1.8S DA DSM II vs Viltrox AF 85mm f/2.0 EVO · Sony FE 400mm f/4.5 GM OSS vs Sigma 200mm f/2 DG OS Sports · all Sony E lenses · all comparisons

Yongnuo YN 50mm f/1.8S DA DSM IIAffiliate linkSee price on Amazon