Sigma 20mm F1.4 DG DN | Art (L-Mount) vs Sirui Swift 20mm F2.4 (L-Mount)
The Sigma is brighter (f/1.4 vs f/2.4). The Sirui is 423g lighter and cost $750 less at launch.
Key differences
- The Sirui is 423g lighter (212g vs 635g).
- The Sigma is faster: f/1.4 vs f/2.4 (≈1.6 stops more light).
- At launch the Sirui cost $750 less ($149 vs $899).
- For close-ups the Sigma reaches 0.16× vs 0.14×.
Which to choose
- 20mm F1.4 DG DN | Art (L-Mount)
Choose it for:
- +The brightest aperture: f/1.4, about 1.6 stops more light
- Swift 20mm F2.4 (L-Mount)
Choose it for:
- +The lightest option: 212g, 423g less than the next
- +The lowest launch price: $149, $750 less
Computed from published specs, confirmed launch prices and, where every lens has at least two reviews, review scores.
- Mount
- L-Mount (FF)
- L-Mount (FF)
- Focal length
- 20mm
- 20mm
- Max aperture
- F1.4◆
- F2.4
- Weight
- 635g
- 212g◆
- Dimensions ⌀ × L
- 87.8 × 111.2mm
- 69.5 × 60.3mm
- Volume
- 673 cm³
- 229 cm³◆
- Density
- 0.94 g/cm³
- 0.93 g/cm³
- Filter thread
- ⌀82mm
- ⌀58mm
- Min focus
- 0.23m
- 0.20m◆
- Max magnification
- 0.16×◆
- 0.14×
- Elements / groups
- 17 / 15
- 11 / 9
- Aperture blades
- 11◆
- 9
- Focus drive
- Stepping Motor
- STM
- Stabilisation
- —
- —
- Weather sealed
- Yes
- Yes
- Aperture ring
- Yes · de-click
- Yes
- Released
- 2022
- 2026
- MSRP (USD)
- $899
- $149◆
- Sharpness
- 8.5
- —
- Bokeh Rendering
- 8.0
- —
- Autofocus Speed
- 8.4
- —
- Flare Resistance
- 8.0
- —
- Build / Sealing
- 8.9
- —
- Value / Size
- 8.8
- —
Performance overlay
- 20mm F1.4 DG DN | Art (L-Mount)
- Swift 20mm F2.4 (L-Mount)
◆ marks the best value in a row. Scores are 0–10 editorial ratings.