Sony FE 40mm f/2.5 G vs Samyang AF 45mm f/1.8 FE
Both are Sony E mount primes for everyday and standard prime — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.
| Spec | Sony FE 40mm f/2.5 G | Samyang AF 45mm f/1.8 FE |
|---|---|---|
| Focal length | 40mm | 45mm |
| Max aperture | f/2.5 | f/1.8 |
| Type | prime | prime |
| Coverage | full-frame | full-frame |
| Mount | Sony E | Sony E |
Which should you buy?
- the Samyang AF 45mm f/1.8 FE opens wider (f/1.8) — brighter in low light and more background blur
- the Sony FE 40mm f/2.5 G (40mm) is wider — more in the frame for street and interiors; the Samyang AF 45mm f/1.8 FE (45mm) is tighter — more reach and compression for portraits
- the Sony FE 40mm f/2.5 G is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Samyang AF 45mm f/1.8 FE is third-party — usually the value pick
Where to buy
Sony FE 40mm f/2.5 GSee price on Amazon
Samyang AF 45mm f/1.8 FESee price on Amazon
FAQ
What's the difference between the Sony FE 40mm f/2.5 G and the Samyang AF 45mm f/1.8 FE?
The Sony FE 40mm f/2.5 G is 40mm f/2.5 prime, full-frame; the Samyang AF 45mm f/1.8 FE is 45mm f/1.8 prime, full-frame. Both fit the Sony E mount.
Which is better in low light, the Sony FE 40mm f/2.5 G or the Samyang AF 45mm f/1.8 FE?
The Samyang AF 45mm f/1.8 FE — its f/1.8 maximum aperture lets in more light and gives more background blur than the f/2.5 of the other.
Do the Sony FE 40mm f/2.5 G and Samyang AF 45mm f/1.8 FE 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).
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 40mm f/2.5 G vs Zeiss Batis 40mm f/2 CF · Sony FE 50mm f/2.5 G vs Samyang AF 45mm f/1.8 FE · all Sony E lenses · all comparisons