Sigma 40mm T1.5 FF (Sony E) vs Sony FE 40mm F2.5 G
Sigma 40mm T1.5 FF (Sony E) vs Sony FE 40mm F2.5 G
When comparing Sony FE 40mm F2.5 G and Sigma 40mm T1.5 FF (Sony E), which one is better?
1. Lens Weight Comparison
Regarding the weight of the lenses, Sony FE 40mm F2.5 G is the winner with a weight of 173 g compared to the 1620 g that Sigma 40mm T1.5 FF - (Sony E) weighs.
Winner: Sony FE 40mm F2.5 G
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 Sigma 40mm T1.5 FF - (Sony E) has the largest aperture of the two lenses at 1.5 compared to the 2.5 aperture of Sony FE 40mm F2.5 G. 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.
4. Anamorphic Comparison
Neither Sony FE 40mm F2.5 G 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. Focus Distance Comparison
Sony FE 40mm F2.5 G features a minimum focus distance of 28 cm while Sigma 40mm T1.5 FF - (Sony E) has a minimum focus distance of 40 cm. Depending on your shooting style, the Sony FE 40mm F2.5 G might be a better choice.
Winner: Sony FE 40mm F2.5 G
Regarding minimum focus distance: The minimum focus distance of a lens is the smallest distance from the lens to the subject you want to be in focus; subjects closer than the lens' minimum focus distance will not be in focus. Whether or not this is important to you is up for you to decide, but some want to take close photos and videos and in those cases it's important to have a lens with a low minimum focus distance.
6. Lens Type Comparison
Both lenses are Prime lenses, which means that you can choose both Sigma 40mm T1.5 FF - (Sony E) or Sony FE 40mm F2.5 G 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.
7. Filter Thread Comparison
The Sigma 40mm T1.5 FF - (Sony E) feature a filter thread diameter of 82 mm while Sony FE 40mm F2.5 G feature a diameter of 49 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.
8. Stabilization Comparison
Sigma 40mm T1.5 FF - (Sony E) features built-in image stabilization and Sony FE 40mm F2.5 G does not. Depending on your shooting style, this may be a heavy factor to choose Sigma 40mm T1.5 FF - (Sony E) instead of Sony FE 40mm F2.5 G.
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.
9. Autofocus Comparison
In regards to autofocus, the winner is Sony FE 40mm F2.5 G since the other lens in this comparison, the Sigma 40mm T1.5 FF - (Sony E) does not have autofocus at all — it is a manual focus lens.
Winner: Sony FE 40mm F2.5 G
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.
10. Macro Comparison
Neither Sigma 40mm T1.5 FF - (Sony E) or Sony FE 40mm F2.5 G 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.
11. Weather Seal Comparison
Both Sigma 40mm T1.5 FF - (Sony E) and Sony FE 40mm F2.5 G 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.
12. Full Frame Comparison
Both Sony FE 40mm F2.5 G 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 Sony FE 40mm F2.5 G:
| Sigma 40mm T1.5 FF - (Sony E) | Sony FE 40mm F2.5 G | |
 |  | |
| Brand | Sigma | Sony |
| Weight | 1620 g | 173 g |
| Lens Mount | Sony E | Sony E |
| Focal Length | 40 mm | 40 mm |
| Largest Aperture | 1.5 | 2.5 |
| Anamorphic | No | No |
| Minimum Focus Distance | 40 cm | 28 cm |
| Type | Prime | Prime |
| Aperture Range | 1.5 - 16 | Missing |
| Filter Thread Diameter | 82 | 49 |
| Lens Groups | Missing | 9 |
| Lens Elements | Missing | 9 |
| Image Stabilization | Yes | No |
| Autofocus | Hayır | Evet |
| Macro | No | No |
| Weather Seal | Yes | Yes |
| Full Frame Coverage | Yes | Yes |
| Lens Hood Included | No | Yes |