Sigma Art 17-40mm f/1.8 DC
Pentax DA 21790 55mm
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
Pentax DA 21790 55mm
The Pentax DA* 55mm f/1.4 SDM lens receives overwhelmingly positive feedback for its sharpness, beautiful bokeh, and excellent performance in low light and portraits. Users praise its clarity and value, though some note it may have focusing issues on older Pentax DSLR bodies. Overall, it is considered a superb lens that delivers professional-quality results.
Pros
- Razor sharp image quality
- Beautiful smooth bokeh
- Excellent low-light performance
- Great for portraits and events
- Weather-sealed for outdoor use
Cons
- Potential focusing issues on older Pentax bodies
- Slightly large size
- Not as sharp as Carl Zeiss lenses
Scores
Specifications
| Sigma Art 17-40mm f/1.8 DC | Pentax DA 21790 55mm | |
|---|---|---|
| Optics | ||
| Type | zoom | prime |
| Focal Length Min | 17 mm | 55 mm |
| Focal Length Max | 40 mm | 55 mm |
| Elements | 17 | 9 |
| Groups | 11 | 8 |
| Aspherical Elements | 4★ | 0 |
| ED Elements | 4★ | 1 |
| Coating | Super Multi-Layer Coating | Aero Bright coating, Super Protect (SP) coating |
| Aperture | ||
| Max Aperture | f/1.8 | f/22 |
| Min Aperture | f/1.8 | f/1.4 |
| Constant | ✓ | ✓ |
| Diaphragm Blades | 11★ | 9 |
| Build | ||
| Mount | Fujifilm X | Pentax K |
| Format | APS-C | APS-C |
| Weather Sealed | ✓ | ✓ |
| Weight | 0.54 kg | 0.38 kg★ |
| Filter Thread | 67 mm | 58 mm |
| AF & Stabilization | ||
| AF Type | HLA (High-response Linear Actuator) | SDM |
| Stabilization | ✗ | ✗ |
| Focus | ||
| Min Focus Distance | 280 mm★ | 450 mm |
| Max Magnification | 1:4.8★ | 0.3x |
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)
Pentax DA 21790 55mm
- Strong build (79th percentile)
- Strong user sentiment (66th percentile)
- Below average aperture (22nd percentile)
- Below average bokeh (25th percentile)
- Below average versatility (33rd percentile)
- Below average stabilization (34th percentile)
Pricing
Sigma Art 17-40mm f/1.8 DC
No current pricing available
Pentax DA 21790 55mm
Verdict
Scores 96 overall, wins 9 of 9 usage categories and 5 of 21 specs.
