Zeiss Ultra Prime 100mm T1.9 vs Sirui Venus 100mm T2.9 1.6x Sony E
Zeiss Ultra Prime 100mm T1.9 vs Sirui Venus 100mm T2.9 1.6x Sony E
When comparing Sirui Venus 100mm T2.9 1.6x Sony E and Zeiss Ultra Prime 100mm T1.9, which one is better?
1. Largest Aperture Comparison
The Zeiss Ultra Prime 100mm T1.9 has the largest aperture of the two lenses at 1.9 compared to the 2.9 aperture of Sirui Venus 100mm T2.9 1.6x - Sony E. This means that you get more light to your sensor using Zeiss Ultra Prime 100mm T1.9 wide open, and therefore it might be a better lens in dark situations.
Winner: Zeiss Ultra Prime 100mm 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.
2. Lens Type Comparison
Both lenses are Prime lenses, which means that you can choose both Zeiss Ultra Prime 100mm T1.9 or Sirui Venus 100mm T2.9 1.6x - Sony E if you're looking for that type of lens.
Winner: Tied
Regarding type: There are two types of lenses; zoom lenses and prime lenses. Prime lenses have a fixed focal length and cannot be zoomed, while zoom lenses have a focal length range and can be zoomed in to get closer to the subject. Prime lenses are usually lighter, cheaper and let in more light. Zoom lenses are more versatile but are more expensive since they require a more advanced lens design.
Specifications
Full specifications table of Zeiss Ultra Prime 100mm T1.9 and Sirui Venus 100mm T2.9 1.6x Sony E:
| Zeiss Ultra Prime 100mm T1.9 | Sirui Venus 100mm T2.9 1.6x - Sony E | |
 |  | |
| Brand | Zeiss | Sirui |
| Lens Mount | Missing | Sony E |
| Focal Length | 100 mm | 100 mm |
| Largest Aperture | 1.9 | 2.9 |
| Anamorphic | Missing | Yes |
| Anamorphic Squeeze Factor | Missing | 1.6 |
| Type | Prime | Prime |
| Image Stabilization | Missing | No |