Sigma 40mm T1.5 FF (Sony E) vs Irix 45mm T1.5 Sony E
Sigma 40mm T1.5 FF (Sony E) vs Irix 45mm T1.5 Sony E
When comparing Irix 45mm T1.5 Sony E and Sigma 40mm T1.5 FF (Sony E), which one is better?
1. Lens Weight Comparison
Regarding the weight of the lenses, Irix 45mm T1.5 - Sony E is the winner with a weight of 1100 g compared to the 1620 g that Sigma 40mm T1.5 FF - (Sony E) weighs.
Winner: Irix 45mm T1.5 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
Both lenses share the same aperture of 1.5 — this means that you may buy both Sigma 40mm T1.5 FF - (Sony E) and Irix 45mm T1.5 - Sony E in this regard; they''re the same.
Winner: Tied
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 40mm T1.5 FF - (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 40mm T1.5 FF - (Sony E) feature a filter thread diameter of 82 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
Sigma 40mm T1.5 FF - (Sony E) features built-in image stabilization and Irix 45mm T1.5 - Sony E does not. Depending on your shooting style, this may be a heavy factor to choose Sigma 40mm T1.5 FF - (Sony E) instead of Irix 45mm T1.5 - Sony E.
Winner: Sigma 40mm T1.5 FF (Sony E)
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
None of the lenses have an autofocus feature, which means that both lenses are manual focus lenses.
Winner: Tied — Neither have this feature
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 40mm T1.5 FF - (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. Weather Seal Comparison
Both Sigma 40mm T1.5 FF - (Sony E) and Irix 45mm T1.5 - Sony E feature a weather sealed design, making them both great in that aspect.
Winner: Tied — both have this feature
Regarding weather seal: A lens that is weather sealed will perform better over time if you're using the lens in harsh conditions where it's wet or dusty. It may not matter if you're merely using your lens in a studio or in your home.
10. Full Frame Comparison
Both Irix 45mm T1.5 - Sony E and Sigma 40mm T1.5 FF - (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 40mm T1.5 FF (Sony E) and Irix 45mm T1.5 Sony E:
| Sigma 40mm T1.5 FF - (Sony E) | Irix 45mm T1.5 - Sony E | |
 |  | |
| Brand | Sigma | Irix |
| Weight | 1620 g | 1100 g |
| Lens Mount | Sony E | Sony E |
| Focal Length | 40 mm | 45 mm |
| Largest Aperture | 1.5 | 1.5 |
| Anamorphic | No | No |
| Minimum Focus Distance | 40 cm | Missing |
| Type | Prime | Missing |
| Aperture Range | 1.5 - 16 | 1.5 - 22 |
| Filter Thread Diameter | 82 | 86 |
| Lens Front Diameter (Not Filter Thread) | Missing | 95 mm |
| Aperture Blades | Missing | 9 |
| Lens Groups | Missing | 9 |
| Lens Elements | Missing | 11 |
| Image Stabilization | Yes | No |
| Autofocus | Hayır | Hayır |
| Macro | No | No |
| Weather Seal | Yes | Yes |
| Full Frame Coverage | Yes | Yes |
| Lens Hood Included | No | No |