Sigma 30mm f/1.4 DC DN Contemporary vs Viltrox AF 9mm f/2.8 AIR
The bottom line
These cover different focal lengths — the Sigma 30mm f/1.4 DC DN Contemporary is 30mm, the Viltrox AF 9mm f/2.8 AIR is 9mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 30mm f/1.4 DC DN Contemporary for standard, the Viltrox AF 9mm f/2.8 AIR for wide-angle.
Choose the Sigma 30mm f/1.4 DC DN Contemporary 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 need more reach — it goes to 30mm vs 9mm for distant subjects, wildlife and sport.
Choose the Viltrox AF 9mm f/2.8 AIR if…
- ✓You shoot wide — it starts at 9mm vs 30mm for landscapes, interiors and architecture.
- ✓You're on a budget — $199 vs $349 leaves more for other gear.
- ✓You value portability — at 175g (6.2 oz) it's lighter than the 265g (9.3 oz) alternative for travel and all-day carry.
- ✓You work outdoors — it's weather-sealed against dust and moisture; the other isn't.
Where they differ
- ›Aperture: the Sigma 30mm f/1.4 DC DN Contemporary opens to f/1.4 vs the Viltrox AF 9mm f/2.8 AIR's f/2.8 — more light and shallower depth-of-field.
- ›Focal range: Sigma 30mm f/1.4 DC DN Contemporary is 30mm, Viltrox AF 9mm f/2.8 AIR is 9mm — different framing and reach.
- ›Price: the Viltrox AF 9mm f/2.8 AIR is $199, $150 under the Sigma 30mm f/1.4 DC DN Contemporary.
- ›Weight: the Viltrox AF 9mm f/2.8 AIR is 175g (6.2 oz) vs 265g (9.3 oz) — you'll feel the difference handheld.
- ›Durability: the Viltrox AF 9mm f/2.8 AIR is weather-sealed; the other isn't.
Frequently asked
Is the Sigma 30mm f/1.4 DC DN Contemporary or the Viltrox AF 9mm f/2.8 AIR better?
These cover different focal lengths — the Sigma 30mm f/1.4 DC DN Contemporary is 30mm, the Viltrox AF 9mm f/2.8 AIR is 9mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 30mm f/1.4 DC DN Contemporary for standard, the Viltrox AF 9mm f/2.8 AIR for wide-angle.
Who should choose the Sigma 30mm f/1.4 DC DN Contemporary?
Choose the Sigma 30mm f/1.4 DC DN Contemporary 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 need more reach — it goes to 30mm vs 9mm for distant subjects, wildlife and sport.
Who should choose the Viltrox AF 9mm f/2.8 AIR?
Choose the Viltrox AF 9mm f/2.8 AIR if you shoot wide — it starts at 9mm vs 30mm for landscapes, interiors and architecture. Choose it if you're on a budget — $199 vs $349 leaves more for other gear. Choose it if you value portability — at 175g (6.2 oz) it's lighter than the 265g (9.3 oz) alternative for travel and all-day carry. Choose it if you work outdoors — it's weather-sealed against dust and moisture; the other isn't.
What is the main difference between the Sigma 30mm f/1.4 DC DN Contemporary and the Viltrox AF 9mm f/2.8 AIR?
Aperture: the Sigma 30mm f/1.4 DC DN Contemporary opens to f/1.4 vs the Viltrox AF 9mm f/2.8 AIR's f/2.8 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 30mm | 9mm |
| Lens Type | Prime | Prime |
| Optical Elements | 9 | 13 |
| Optical Groups | 6 | 11 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.4 | f/2.8 |
| Minimum Aperture | f/16 | f/16 |
| Aperture Blades | 9 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | APS-C | APS-C |
| Lens Mount | Sony E | Sony E |
| Angle of View | 51° | 113.8° |
| 35mm Equivalent | 45-45mm | 14-14mm |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | STM |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 30 cm | 13 cm |
| Max Magnification | 0.1x | − |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | No |
| Declickable Aperture | Yes | No |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $349 | $199 |
| Filter Size | 52mm | 58mm |
| Diameter | 64.8mm | − |
| Length | 51.5mm | − |
| Weight | 265g (9.3 oz) | 175g (6.2 oz) |
| Weather Sealed | No | Yes |
| Tripod Collar | No | No |
