Sirui Swift 40mm F2.2 vs Viltrox AF 40mm F2.5 Air FE
The Sirui is brighter (f/2.2 vs f/2.5), is weather sealed and has an aperture ring.
Key differences
- The Viltrox is 43g lighter (167g vs 210g).
- The Sirui is faster: f/2.2 vs f/2.5 (≈0.4 stops more light).
- At launch the Sirui cost $19 less ($149 vs $168).
Which to choose
- Swift 40mm F2.2
Choose it for:
- +The brightest aperture: f/2.2, about 0.4 stop more light
- +Weather sealing
- +A physical aperture ring
- AF 40mm F2.5 Air FE
No clear advantage on paper. Compare handling and the full specs below.
Computed from published specs, confirmed launch prices and, where every lens has at least two reviews, review scores.
Sirui
Swift 40mm F2.2
Viltrox
AF 40mm F2.5 Air FE
- Mount
- Sony E (FE)
- Sony E (FE)
- Focal length
- 40mm
- 40mm
- Max aperture
- F2.2◆
- F2.5
- Weight
- 210g
- 167g◆
- Dimensions ⌀ × L
- 69.5 × 62.3mm
- 65.0 × 59.5mm
- Volume
- 236 cm³
- 197 cm³◆
- Density
- 0.89 g/cm³
- 0.85 g/cm³
- Filter thread
- ⌀58mm
- ⌀52mm
- Min focus
- 0.40m
- 0.34m◆
- Max magnification
- 0.14×
- 0.14×
- Elements / groups
- 11 / 8
- 10 / 6
- Aperture blades
- 9◆
- 7
- Focus drive
- STM
- STM (Lead Screw)
- Stabilisation
- —
- —
- Weather sealed
- Yes
- —
- Aperture ring
- Yes
- —
- Released
- 2026
- 2024
- MSRP (USD)
- $149◆
- $168
- Sharpness
- —
- 7.8
- Bokeh Rendering
- —
- 6.8
- Autofocus Speed
- —
- 7.6
- Flare Resistance
- —
- 7.0
- Build / Sealing
- —
- 6.8
- Value / Size
- —
- 9.3
Performance overlay
- Swift 40mm F2.2
- AF 40mm F2.5 Air FE
◆ marks the best value in a row. Scores are 0–10 editorial ratings.