Sigma 90mm f/2.8 DG DN Contemporary (Sony E) vs Irix 45mm T1.5 Sony E
Sigma 90mm f/2.8 DG DN Contemporary (Sony E) vs Irix 45mm T1.5 Sony E
When comparing Irix 45mm T1.5 Sony E and Sigma 90mm f/2.8 DG DN Contemporary (Sony E), which one is better?
1. Lens Weight Comparison
Regarding the weight of the lenses, Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) is the winner with a weight of 295 g compared to the 1100 g that Irix 45mm T1.5 - Sony E weighs.
Winner: Sigma 90mm f/2.8 DG DN Contemporary (Sony E)
Regarding weight: The weight of a lens is something you need to consider, since you have to carry it around on the camera as long as you're shooting. It adds to the total weight of your camera and it's important to keep the weight low if you get tired in your arms when taking photographs or filming.
2. Lens Mount Comparison
These two lenses use the same lens mount, the Sony E. This means that both lenses are compatible with cameras that use this mount.
Winner: Tied
Regarding lens mount: Popular lens mounts are Canon RF and EF, Micro Four Thirds and Nikon Z. Different lens mounts lets you connect different lenses to camera bodies, but some might not be compatible. This can be helped by using an adapter, like a Canon EF to RF adapter.
3. Largest Aperture Comparison
The Irix 45mm T1.5 - Sony E has the largest aperture of the two lenses at 1.5 compared to the 2.8 aperture of Sigma 90mm f/2.8 DG DN Contemporary - (Sony E). This means that you get more light to your sensor using Irix 45mm T1.5 - Sony E wide open, and therefore it might be a better lens in dark situations.
Winner: Irix 45mm T1.5 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.
4. Anamorphic Comparison
Neither Irix 45mm T1.5 - Sony E or Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) are anamorphic lenses.
Winner: Tied — Neither have this feature
Regarding anamorphic: Anamorphic lenses are usually used on cinema cameras and squeezes the image when its recorded, which gives the final, stretched out, image oval bokeh and a different angle of view. The most common lenses, however, are not anamorphic but spherical, which gives a spherical bokeh and is a much cheaper lens design.
5. Filter Thread Comparison
The Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) feature a filter thread diameter of 55 mm while Irix 45mm T1.5 - Sony E feature a diameter of 86 mm. Depending on your current gear (like other lenses or filters) one of them might be favorable over the other.
Winner: Tied — It depends on your gear
Regarding filter thread diameter: The filter thread diameter is the size of which the lens is compatible with screw-on filters, such as CPL, ND or IR filters. If you have several lenses of a certain size, it might be a good idea to keep the same filter thread size to make sure your filters work on all your lenses. If not, then you may buy step up rings to adapt from a certain diameter to the filter thread diameter of your other lenses.
6. Stabilization Comparison
Neither Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) or Irix 45mm T1.5 - Sony E feature built-in image stabilization.
Winner: Tied — Neither have this feature
Regarding image stabilization: When a lens features built-in stabilization, it will actively help you hold the image steady by adjusting the optical elements inside the lens to compensate for movements. Do remember that lens stabilization is not required, but it may be suitable depending on your specific needs.
7. Autofocus Comparison
In regards to autofocus, the winner is Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) since the other lens in this comparison, the Irix 45mm T1.5 - Sony E does not have autofocus at all — it is a manual focus lens.
Winner: Sigma 90mm f/2.8 DG DN Contemporary (Sony E)
Regarding autofocus: Lenses with autofocus help you focus when shooting pictures or video. If a lens only has manual focus it means that you have to focus manually by adjusting the focus wheel on the lens. Most cinema lenses do not use autofocus and are manual focus only.
8. Macro Comparison
Neither Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) or Irix 45mm T1.5 - Sony E are macro lenses.
Winner: Tied — Neither have this feature
Regarding macro: Macro lenses can focus much closer to your subjects and might be suitable when photographing flowers, insects, wildlife and nature.
9. Full Frame Comparison
Both Irix 45mm T1.5 - Sony E and Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) cover a full frame sensor and can be used on full frame cameras as well as cameras with smaller sensors.
Winner: Tied — both have this feature
Regarding full frame coverage: All lenses do not cover full frame sensors, but not all cameras are full frame cameras either. If a lens covers a full frame sensor it can be used on all cameras with a matching lens mount, both full frame and crop sensors, except for medium format cameras.
Specifications
Full specifications table of Sigma 90mm f/2.8 DG DN Contemporary (Sony E) and Irix 45mm T1.5 Sony E:
| Sigma 90mm f/2.8 DG DN Contemporary - (Sony E) | Irix 45mm T1.5 - Sony E | |
 |  | |
| Brand | Sigma | Irix |
| Weight | 295 g | 1100 g |
| Lens Mount | Sony E | Sony E |
| Focal Length | 90 mm | 45 mm |
| Largest Aperture | 2.8 | 1.5 |
| Anamorphic | No | No |
| Minimum Focus Distance | 50 cm | Missing |
| Type | Prime | Missing |
| Aperture Range | 2.8 - 22 | 1.5 - 22 |
| Filter Thread Diameter | 55 | 86 |
| Lens Front Diameter (Not Filter Thread) | Missing | 95 mm |
| Aperture Blades | Missing | 9 |
| Lens Groups | 10 | 9 |
| Lens Elements | 11 | 11 |
| Image Stabilization | No | No |
| Autofocus | Evet | Hayır |
| Macro | No | No |
| Weather Seal | Missing | Yes |
| Full Frame Coverage | Yes | Yes |
| Lens Hood Included | Yes | No |