Sigma 12mm F1.4 DC Contemporary vs Sony FE 40mm f/2.5 G
The bottom line
These cover different focal lengths — the Sigma 12mm F1.4 DC Contemporary is 12mm, the Sony FE 40mm f/2.5 G is 40mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 12mm F1.4 DC Contemporary for wide-angle, the Sony FE 40mm f/2.5 G for standard.
Choose the Sigma 12mm F1.4 DC Contemporary if…
- ✓You want more light and background blur — f/1.4 is faster than f/2.5, better for low light and subject separation.
- ✓You shoot wide — it starts at 12mm vs 40mm for landscapes, interiors and architecture.
Choose the Sony FE 40mm f/2.5 G if…
- ✓You need more reach — it goes to 40mm vs 12mm for distant subjects, wildlife and sport.
- ✓You value portability — at 173g (6.1 oz) it's lighter than the 225g (7.9 oz) alternative for travel and all-day carry.
- ✓You like close-focus work — 0.23x magnification vs 0.1x.
Where they differ
- ›Aperture: the Sigma 12mm F1.4 DC Contemporary opens to f/1.4 vs the Sony FE 40mm f/2.5 G's f/2.5 — more light and shallower depth-of-field.
- ›Focal range: Sigma 12mm F1.4 DC Contemporary is 12mm, Sony FE 40mm f/2.5 G is 40mm — different framing and reach.
Frequently asked
Is the Sigma 12mm F1.4 DC Contemporary or the Sony FE 40mm f/2.5 G better?
These cover different focal lengths — the Sigma 12mm F1.4 DC Contemporary is 12mm, the Sony FE 40mm f/2.5 G is 40mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 12mm F1.4 DC Contemporary for wide-angle, the Sony FE 40mm f/2.5 G for standard.
Who should choose the Sigma 12mm F1.4 DC Contemporary?
Choose the Sigma 12mm F1.4 DC Contemporary if you want more light and background blur — f/1.4 is faster than f/2.5, better for low light and subject separation. Choose it if you shoot wide — it starts at 12mm vs 40mm for landscapes, interiors and architecture.
Who should choose the Sony FE 40mm f/2.5 G?
Choose the Sony FE 40mm f/2.5 G if you need more reach — it goes to 40mm vs 12mm for distant subjects, wildlife and sport. Choose it if you value portability — at 173g (6.1 oz) it's lighter than the 225g (7.9 oz) alternative for travel and all-day carry. Choose it if you like close-focus work — 0.23x magnification vs 0.1x.
What is the main difference between the Sigma 12mm F1.4 DC Contemporary and the Sony FE 40mm f/2.5 G?
Aperture: the Sigma 12mm F1.4 DC Contemporary opens to f/1.4 vs the Sony FE 40mm f/2.5 G's f/2.5 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 12mm | 40mm |
| Lens Type | Prime | Prime |
| Optical Elements | 14 | 8 |
| Optical Groups | 12 | 7 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.4 | f/2.5 |
| Minimum Aperture | f/16 | f/22 |
| Aperture Blades | 9 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | APS-C | Full-Frame |
| Lens Mount | Sony E | Sony E |
| Angle of View | 99.6° | 57° |
| 35mm Equivalent | 18-18mm | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | XD Linear |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 17 cm | 25 cm |
| Max Magnification | 0.1x | 0.23x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | Yes |
| Declickable Aperture | Yes | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $629 | $599 |
| Filter Size | 62mm | 49mm |
| Diameter | 68mm | 68mm |
| Length | 69mm | 45.5mm |
| Weight | 225g (7.9 oz) | 173g (6.1 oz) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
