Zeiss Ultra Prime 40mm T1.9 vs Sigma 40mm T1.5 FF (Sony E)
Zeiss Ultra Prime 40mm T1.9 vs Sigma 40mm T1.5 FF (Sony E)
When comparing Sigma 40mm T1.5 FF (Sony E) and Zeiss Ultra Prime 40mm T1.9, which one is better?
1. Largest Aperture Comparison
The Sigma 40mm T1.5 FF - (Sony E) has the largest aperture of the two lenses at 1.5 compared to the 1.9 aperture of Zeiss Ultra Prime 40mm T1.9. This means that you get more light to your sensor using Sigma 40mm T1.5 FF - (Sony E) wide open, and therefore it might be a better lens in dark situations.
Winner: Sigma 40mm T1.5 FF (Sony E)
Regarding largest aperture: A lower aperture number means that the widest aperture on the lens is larger. This means that more light will hit the sensor and also that the depth of field will be shallower, better separating your subject from the background.
Specifications
Full specifications table of Zeiss Ultra Prime 40mm T1.9 and Sigma 40mm T1.5 FF (Sony E):
| Zeiss Ultra Prime 40mm T1.9 | Sigma 40mm T1.5 FF - (Sony E) | |
 |  | |
| Brand | Zeiss | Sigma |
| Weight | Missing | 1620 g |
| Lens Mount | Missing | Sony E |
| Focal Length | 40 mm | 40 mm |
| Largest Aperture | 1.9 | 1.5 |
| Anamorphic | Missing | No |
| Minimum Focus Distance | Missing | 40 cm |
| Type | Missing | Prime |
| Aperture Range | Missing | 1.5 - 16 |
| Filter Thread Diameter | Missing | 82 |
| Image Stabilization | Missing | Yes |
| Autofocus | Missing | Hayır |
| Macro | Missing | No |
| Weather Seal | Missing | Yes |
| Full Frame Coverage | Missing | Yes |
| Lens Hood Included | Missing | No |