Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) vs Viltrox AF 56mm f/1.2 PRO (Fujifilm X)
The bottom line
These cover different focal lengths — the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 18-50mm, the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) is 56mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) for standard, the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) for short-telephoto / portrait.
Choose the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) if…
- ✓You shoot wide — it starts at 18mm vs 56mm for landscapes, interiors and architecture.
- ✓You want one-lens flexibility — a 18-50mm zoom covers what the fixed 56mm can't reframe.
- ✓You value portability — at 290g (10.2 oz) it's lighter than the 595g (1.31 lb) alternative for travel and all-day carry.
Choose the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) if…
- ✓You want more light and background blur — f/1.2 is faster than f/2.8, better for low light and subject separation.
- ✓You prefer a fast, compact single focal length — a 56mm prime over a zoom.
Where they differ
- ›Aperture: the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) opens to f/1.2 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 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 18-50mm, Viltrox AF 56mm f/1.2 PRO (Fujifilm X) is 56mm — different framing and reach.
- ›Type: the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is a zoom (flexible framing), the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) a prime (one focal length, usually brighter and lighter).
- ›Weight: the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 290g (10.2 oz) vs 595g (1.31 lb) — you'll feel the difference handheld.
Frequently asked
Is the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) or the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) better?
These cover different focal lengths — the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) is 18-50mm, the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) is 56mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) for standard, the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) for short-telephoto / portrait.
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 shoot wide — it starts at 18mm vs 56mm for landscapes, interiors and architecture. Choose it if you want one-lens flexibility — a 18-50mm zoom covers what the fixed 56mm can't reframe. Choose it if you value portability — at 290g (10.2 oz) it's lighter than the 595g (1.31 lb) alternative for travel and all-day carry.
Who should choose the Viltrox AF 56mm f/1.2 PRO (Fujifilm X)?
Choose the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) if you want more light and background blur — f/1.2 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 56mm prime over a zoom.
What is the main difference between the Sigma 18-50mm f/2.8 DC DN Contemporary (Fuji X) and the Viltrox AF 56mm f/1.2 PRO (Fujifilm X)?
Aperture: the Viltrox AF 56mm f/1.2 PRO (Fujifilm X) opens to f/1.2 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 | 18-50mm | 56mm |
| Lens Type | Zoom | Prime |
| Optical Elements | 13 | 13 |
| Optical Groups | 10 | 8 |
| Aperture & Iris | ||
| Maximum Aperture | f/2.8 | f/1.2 |
| Minimum Aperture | f/22 | f/16 |
| Aperture Blades | 9 | 11 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | APS-C | APS-C |
| Lens Mount | Fujifilm X | Fujifilm X |
| Angle of View | 76° – 32° | 29° |
| 35mm Equivalent | 27-75mm | 85-85mm |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | Dual HyperVCM |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 13 cm | 50 cm |
| Max Magnification | 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) | $599 | $580 |
| Filter Size | 52mm | 67mm |
| Diameter | 65.4mm | 78.4mm |
| Length | 76.9mm | 94mm |
| Weight | 290g (10.2 oz) | 595g (1.31 lb) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
