Sirui Swift 40mm F2.2 vs Voigtlander Septon 40mm F2 Aspherical
The Sirui has autofocus and is weather sealed.
Key differences
- The Voigtlander is 45g lighter (165g vs 210g).
- The Voigtlander is faster: f/2 vs f/2.2 (≈0.3 stops more light).
- The Voigtlander is manual focus only.
- For close-ups the Voigtlander reaches 0.19× vs 0.14×.
Which to choose
- Swift 40mm F2.2
Choose it for:
- +Autofocus
- +Weather sealing
- Septon 40mm F2 Aspherical
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
Voigtlander
Septon 40mm F2 Aspherical
- Mount
- Sony E (FE)
- Sony E (FE)
- Focal length
- 40mm
- 40mm
- Max aperture
- F2.2
- F2◆
- Weight
- 210g
- 165g◆
- Dimensions ⌀ × L
- 69.5 × 62.3mm
- 61.7 × 30.0mm
- Volume
- 236 cm³
- 90 cm³◆
- Density
- 0.89 g/cm³
- 1.84 g/cm³
- Filter thread
- ⌀58mm
- ⌀52mm
- Min focus
- 0.40m
- 0.30m◆
- Max magnification
- 0.14×
- 0.19×◆
- Elements / groups
- 11 / 8
- 7 / 6
- Aperture blades
- 9
- 10◆
- Focus drive
- STM
- Manual Helicoid
- Stabilisation
- —
- —
- Weather sealed
- Yes
- —
- Aperture ring
- Yes
- Yes
- Released
- 2026
- 2026
- MSRP (USD)
- $149
- Unconfirmed
- Sharpness
- —
- —
- Bokeh Rendering
- —
- —
- Autofocus Speed
- —
- MF
- Flare Resistance
- —
- —
- Build / Sealing
- —
- —
- Value / Size
- —
- —
Performance overlay
- Swift 40mm F2.2
- Septon 40mm F2 Aspherical
◆ marks the best value in a row. Scores are 0–10 editorial ratings.