Sigma 15mm F1.4 DC Contemporary (Fujifilm X) vs Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X)
The bottom line
These cover different focal lengths — the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) is 15mm, the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 18-50mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) for wide-angle, the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) for standard.
Choose the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) if…
- ✓You want more light and background blur — f/1.4 is faster than f/2.8, better for low light and subject separation.
- ✓You prefer a fast, compact single focal length — a 15mm prime over a zoom.
- ✓You value portability — at 220g (7.8 oz) it's lighter than the 290g (10.2 oz) alternative for travel and all-day carry.
Choose the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) if…
- ✓You need more reach — it goes to 50mm vs 15mm for distant subjects, wildlife and sport.
- ✓You want one-lens flexibility — a 18-50mm zoom covers what the fixed 15mm can't reframe.
- ✓You like close-focus work — 0.5x magnification vs 0.15x.
Where they differ
- ›Aperture: the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) opens to f/1.4 vs the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X)'s f/2.8 — more light and shallower depth-of-field.
- ›Focal range: Sigma 15mm F1.4 DC Contemporary (Fujifilm X) is 15mm, Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 18-50mm — different framing and reach.
- ›Type: the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is a zoom (flexible framing), the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) a prime (one focal length, usually brighter and lighter).
- ›Close-up: the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) reaches 0.5x magnification vs 0.15x — more for close-up and macro work.
Frequently asked
Is the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) or the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) better?
These cover different focal lengths — the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) is 15mm, the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 18-50mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) for wide-angle, the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) for standard.
Who should choose the Sigma 15mm F1.4 DC Contemporary (Fujifilm X)?
Choose the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) if you want more light and background blur — f/1.4 is faster than f/2.8, better for low light and subject separation. Choose it if you prefer a fast, compact single focal length — a 15mm prime over a zoom. Choose it if you value portability — at 220g (7.8 oz) it's lighter than the 290g (10.2 oz) alternative for travel and all-day carry.
Who should choose the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X)?
Choose the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) if you need more reach — it goes to 50mm vs 15mm for distant subjects, wildlife and sport. Choose it if you want one-lens flexibility — a 18-50mm zoom covers what the fixed 15mm can't reframe. Choose it if you like close-focus work — 0.5x magnification vs 0.15x.
What is the main difference between the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) and the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X)?
Aperture: the Sigma 15mm F1.4 DC Contemporary (Fujifilm X) opens to f/1.4 vs the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X)'s f/2.8 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 15mm | 18-50mm |
| Lens Type | Prime | Zoom |
| Optical Elements | 13 | 13 |
| Optical Groups | 11 | 10 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.4 | f/2.8 |
| Minimum Aperture | f/16 | f/22 |
| Aperture Blades | 9 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | APS-C | APS-C |
| Lens Mount | Fujifilm X | Fujifilm X |
| Angle of View | 82.9° | 76° – 32° |
| 35mm Equivalent | 23-23mm | 27-75mm |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | HLA |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 18 cm | 13 cm |
| Max Magnification | 0.15x | 0.5x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | Yes |
| Declickable Aperture | Yes | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $579 | $599 |
| Filter Size | 58mm | 52mm |
| Diameter | 64mm | 65.4mm |
| Length | 65mm | 76.9mm |
| Weight | 220g (7.8 oz) | 290g (10.2 oz) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
