Sony FE 40mm f/2.5 G vs Sigma 45mm f/2.8 DG Contemporary
Both are Sony E mount primes for street and everyday — 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 | Sigma 45mm f/2.8 DG Contemporary |
|---|---|---|
| Focal length | 40mm | 45mm |
| Max aperture | f/2.5 | f/2.8 |
| Type | prime | prime |
| Coverage | full-frame | full-frame |
| Mount | Sony E | Sony E |
Which should you buy?
- the Sony FE 40mm f/2.5 G opens wider (f/2.5) — 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 Sigma 45mm f/2.8 DG Contemporary (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 Sigma 45mm f/2.8 DG Contemporary is third-party — usually the value pick
Where to buy
Sony FE 40mm f/2.5 GSee price on Amazon
Sigma 45mm f/2.8 DG ContemporarySee price on Amazon
FAQ
What's the difference between the Sony FE 40mm f/2.5 G and the Sigma 45mm f/2.8 DG Contemporary?
The Sony FE 40mm f/2.5 G is 40mm f/2.5 prime, full-frame; the Sigma 45mm f/2.8 DG Contemporary is 45mm f/2.8 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 Sigma 45mm f/2.8 DG Contemporary?
The Sony FE 40mm f/2.5 G — its f/2.5 maximum aperture lets in more light and gives more background blur than the f/2.8 of the other.
Do the Sony FE 40mm f/2.5 G and Sigma 45mm f/2.8 DG 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).
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 · Sony FE 40mm f/2.5 G vs Sigma 35mm f/2 DG Contemporary · Sony FE 40mm f/2.5 G vs Sigma 50mm f/2 DG Contemporary · all Sony E lenses · all comparisons