Sigma Art 17-40mm f/1.8 DC
Rokinon RK20M-C 20mm
What Buyers Say
Sigma Art 17-40mm f/1.8 DC
The Sigma 17-40mm f/1.8 DC DN Art lens is overwhelmingly praised for its exceptional image quality, fast constant aperture, and compact internal zoom design. Users highlight its sharpness, lightweight build, and excellent autofocus performance, especially on crop-sensor mirrorless cameras like the Canon R7 and Fujifilm bodies. A few questions about compatibility with specific cameras and features like weather sealing and aperture ring are noted, but the overall sentiment is extremely positive.
Pros
- Exceptional image quality
- Fast constant f/1.8 aperture
- Compact internal zoom design
- Lightweight build
- Sharp and bright photos
Cons
- No weather sealing mentioned
- No manual aperture ring on some mounts
- Compatibility questions with full-frame cameras
- Expensive for some buyers
Rokinon RK20M-C 20mm
The Rokinon 20mm f/1.8 lens earns high praise for its sharpness and optical quality, especially in astrophotography and landscape use. Reviewers note excellent value for the price and compare it favorably to more expensive Canon and Nikon zooms. Some mention a lack of premium feel and potential de-centering issues, but the majority find it a reliable and capable manual-focus prime.
Pros
- Excellent sharpness
- Great for astrophotography
- Excellent value for money
- Good low-light performance
- Solid build
Cons
- Plastic feel
- Potential de-centering issues
- Manual focus only
Scores
Specifications
| Sigma Art 17-40mm f/1.8 DC | Rokinon RK20M-C 20mm | |
|---|---|---|
| Optics | ||
| Type | zoom | prime |
| Focal Length Min | 17 mm | 20 mm |
| Focal Length Max | 40 mm | 20 mm |
| Elements | 17 | 13 |
| Groups | 11 | 12 |
| Aspherical Elements | 4★ | 2 |
| ED Elements | 4★ | 3 |
| Coating | Super Multi-Layer Coating | Ultra Multi-Coating |
| Aperture | ||
| Max Aperture | f/1.8 | f/22 |
| Min Aperture | f/1.8 | f/1.8 |
| Constant | ✓★ | ✗ |
| Diaphragm Blades | 11★ | 7 |
| Build | ||
| Mount | Fujifilm X | Canon EF |
| Format | APS-C | full-frame★ |
| Weather Sealed | ✓★ | ✗ |
| Weight | 0.54 kg | 0.50 kg★ |
| Filter Thread | 67 mm | 77 mm |
| AF & Stabilization | ||
| AF Type | HLA (High-response Linear Actuator) | manual focus only |
| Stabilization | ✗ | ✗ |
| Focus | ||
| Min Focus Distance | 280 mm | 200 mm★ |
| Max Magnification | 1:4.8★ | — |
Pros & Cons
Sigma Art 17-40mm f/1.8 DC
- Strong user sentiment (98th percentile)98th %ile
- Strong bokeh (97th percentile)97th %ile
- Strong optical (97th percentile)97th %ile
- Strong aperture (95th percentile)95th %ile
- Below average stabilization (34th percentile)
Rokinon RK20M-C 20mm
- Strong optical (86th percentile)86th %ile
- Strong macro (81st percentile)81st %ile
- Strong user sentiment (66th percentile)
- Below average bokeh (14th percentile)14th %ile
- Below average af (15th percentile)15th %ile
- Below average aperture (22nd percentile)
- Below average versatility (33rd percentile)
Pricing
Sigma Art 17-40mm f/1.8 DC offers 1.6x better value for money
Verdict
Scores 96 overall, wins 9 of 9 usage categories and 6 of 21 specs.
