Zeiss Ultra Prime 135mm T1.9 vs Sirui 135mm T2.9 1.8x (Sony E Mount)
Zeiss Ultra Prime 135mm T1.9 vs Sirui 135mm T2.9 1.8x (Sony E Mount)
When comparing Sirui 135mm T2.9 1.8x (Sony E Mount) and Zeiss Ultra Prime 135mm T1.9, which one is better?
1. Largest Aperture Comparison
The Zeiss Ultra Prime 135mm T1.9 has the largest aperture of the two lenses at 1.9 compared to the 2.9 aperture of Sirui 135mm T2.9 1.8x - (Sony E Mount). This means that you get more light to your sensor using Zeiss Ultra Prime 135mm T1.9 wide open, and therefore it might be a better lens in dark situations.
Winner: Zeiss Ultra Prime 135mm T1.9
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 135mm T1.9 and Sirui 135mm T2.9 1.8x (Sony E Mount):
| Zeiss Ultra Prime 135mm T1.9 | Sirui 135mm T2.9 1.8x - (Sony E Mount) | |
 | | |
| Brand | Zeiss | Sirui |
| Lens Mount | Missing | Sony E |
| Focal Length | 135 mm | 135 mm |
| Largest Aperture | 1.9 | 2.9 |
| Anamorphic | Missing | Yes |
| Anamorphic Squeeze Factor | Missing | 1.8 |
| Type | Prime | Missing |