NiSi 15mm F4 Asph vs Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF
NiSi 15mm F4 Asph vs Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF
When comparing Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF and NiSi 15mm F4 Asph, which one is better?
1. Lens Weight Comparison
Regarding the weight of the lenses, Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF is the winner with a weight of 290 g compared to the 470 g that NiSi 15mm F4 Asph weighs.
Winner: Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF
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 Fujifilm XF. 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 18-50mm f/2,8 DC DN Contemporary - Fuji XF has the largest aperture of the two lenses at 2.8 compared to the 4 aperture of NiSi 15mm F4 Asph. This means that you get more light to your sensor using Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF wide open, and therefore it might be a better lens in dark situations.
Winner: Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF
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 Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF or NiSi 15mm F4 Asph 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
Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF features a minimum focus distance of 12 cm while NiSi 15mm F4 Asph has a minimum focus distance of 20 cm. Depending on your shooting style, the Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF might be a better choice.
Winner: Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF
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
The NiSi 15mm F4 Asph is a Prime lens while the Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF is a Zoom lens. Whether or not a zoom lens or a prime lens is what you need, is up to you to decide; they both have their respective strengths and weaknesses.
Winner: Tied — It depends on your gear
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 NiSi 15mm F4 Asph feature a filter thread diameter of 72 mm while Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF feature a diameter of 55 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
Neither NiSi 15mm F4 Asph or Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF 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.
9. Autofocus Comparison
In regards to autofocus, the winner is Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF since the other lens in this comparison, the NiSi 15mm F4 Asph does not have autofocus at all — it is a manual focus lens.
Winner: Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF
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.
Specifications
Full specifications table of NiSi 15mm F4 Asph and Sigma 18-50mm f/2,8 DC DN Contemporary Fuji XF:
| NiSi 15mm F4 Asph | Sigma 18-50mm f/2,8 DC DN Contemporary - Fuji XF | |
 |  | |
| Brand | NiSi Cinema | Sigma |
| Weight | 470 g | 290 g |
| Lens Mount | Fujifilm XF | Fujifilm XF |
| Focal Length | 15 mm | 18 - 50 mm |
| Largest Aperture | 4 | 2.8 |
| Anamorphic | No | No |
| Minimum Focus Distance | 20 cm | 12 cm |
| Type | Prime | Zoom |
| Aperture Range | 4 - 22 | 2.8 - 22 |
| Filter Thread Diameter | 72 | 55 |
| Lens Front Diameter (Not Filter Thread) | Missing | 7 mm |
| Lens Groups | 10 | 10 |
| Lens Elements | 12 | 13 |
| Image Stabilization | No | No |
| Autofocus | Hayır | Evet |
| Full Frame Coverage | Missing | No |