Market price for reference only. Actual prices may vary significantly due to retailer, promotions, condition, and market dynamics — please do verify the exact price before purchasing.
SourceSirui official siteNot AI-generated
Optics
Focal Length | 20mm |
Equiv. Focal Length | 30mm |
Max Aperture | f/2.4 |
Min Aperture | f/16 |
Angle of View | 70.6° |
Aperture Blades | 9 |
Lens Configuration | 9 groups / 11 elements |
Build
Weight | |
Dimensions | ⌀69.5 × 62.3mm |
Filter Size | 58mm |
Autofocus
Autofocus | Yes |
Focus Motor | Stepping STM |
Min Focus Distance | 20cm |
Max Magnification | 0.136x |
Stabilization
OIS | No |
Features
Weather Resistant | Yes |
Aperture Ring | Yes |
Release
Accessories | Lens hood |
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Other lenses at this focal length
7 primes at 18–20mm
| Lens | Aperture | Weight | Focus | WR | Price | Compare |
|---|---|---|---|---|---|---|
| This lensSirui · SwiftAF 20mm F2.4 | f/2.4 | 207g | AF | Yes | ~$149 | |
| Compared with this lens | ||||||
 7ArtisansAF 18mm F2 | f/2⅔ stop faster | 109g98g lighter | AF | Partial | Price N/A | |
 Fujifilm · XFXF 18mm F2 R | f/2⅔ stop faster | 116g91g lighter | AF | No | ~$700 | |
 SG-ImageAF 18mm F2.2 LE | f/2.2⅓ stop faster | 122g85g lighter | AF | No | Price N/A | |
 Fujifilm · XFXF 18mm F1.4 R LM WR | f/1.41⅔ stops faster | 370g163g heavier | AF | Yes | ~$1,200 | |
 7ArtisansMF 18mm F6.3 | f/6.32⅔ stops slower | 58g149g lighter | MF | No | ~$59 | |
 SG-ImageMF 18mm F6.3 | f/6.32⅔ stops slower | 78g129g lighter | MF | No | ~$59 | |
- This lensSirui · SwiftAF 20mm F2.4f/2.4 · 207g · Autofocus · Weather-sealed
~$149
- Compared with this lens
- 7ArtisansAF 18mm F2⅔ stop faster · 98g lighterAutofocus · Partly weather-sealed
Price N/A
- Fujifilm · XFXF 18mm F2 R⅔ stop faster · 91g lighterAutofocus
~$700
- SG-ImageAF 18mm F2.2 LE⅓ stop faster · 85g lighterAutofocus
Price N/A
- Fujifilm · XFXF 18mm F1.4 R LM WR1⅔ stops faster · 163g heavierAutofocus · Weather-sealed
~$1,200
- 7ArtisansMF 18mm F6.32⅔ stops slower · 149g lighterManual focus
~$59
- SG-ImageMF 18mm F6.32⅔ stops slower · 129g lighterManual focus
~$59
Prices are sampled from retailers, not live quotes. Compare puts a lens in your comparison list together with this one.
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