Zeiss Loxia 50mm f/2 vs Yongnuo YN 50mm f/1.8S DA DSM II

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	Zeiss Loxia 50mm f/2	Yongnuo YN 50mm f/1.8S DA DSM II
Focal length	50mm	50mm
Max aperture	f/2	f/1.8
Type	prime	prime
Coverage	full-frame	APS-C
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 Zeiss Loxia 50mm f/2 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

ZEISS Loxia 50mm f/2 Full Frame Manual Focus for Sony E Mount, Black

Zeiss Loxia 50mm f/2See 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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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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FAQ

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

Which is better in low light, the Zeiss Loxia 50mm f/2 or the Yongnuo YN 50mm f/1.8S DA DSM II?
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 Zeiss Loxia 50mm f/2 and Yongnuo YN 50mm f/1.8S DA DSM II 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:

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