Sigma Art 17-40mm f/1.8 DC
Pentax Limited 28050 21mm
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 Limited 28050 21mm
The Pentax HD D FA 21mm f/2.4ED Limited DC WR lens is highly praised for its unique image look, sharpness, and build quality. Users find it a worthy successor to older lenses like the Zeiss Distagon 21mm, with excellent close focusing and minimal distortion. Some note that its magic is best at f/2.4, with vignetting adding character, and that it pairs well with other Pentax Limited lenses.
Pros
- Unique image look at f/2.4
- Excellent sharpness
- Great close focusing ability
- Minimal distortion and chromatic aberrations
- Solid build quality
Cons
- Severe vignetting at f/2.4
- Loses magic at f/5.6
- Images may be overexposed with Pentax K-1
- High cost
- Not as good as 31mm Limited for contrast/saturation
Scores
Specifications
| Sigma Art 17-40mm f/1.8 DC | Pentax Limited 28050 21mm | |
|---|---|---|
| Optics | ||
| Type | zoom | wide-angle |
| Focal Length Min | 17 mm | 21 mm |
| Focal Length Max | 40 mm | 21 mm |
| Elements | 17 | 11 |
| Groups | 11 | 8 |
| Aspherical Elements | 4★ | 1 |
| ED Elements | 4 | 4 |
| Coating | Super Multi-Layer Coating | High-Grade Multi-Layer HD Coating |
| Aperture | ||
| Max Aperture | f/1.8 | f/22 |
| Min Aperture | f/1.8 | f/2.4 |
| Constant | ✓ | ✓ |
| Diaphragm Blades | 11★ | 8 |
| Build | ||
| Mount | Fujifilm X | Pentax K |
| Format | APS-C | full-frame★ |
| Weather Sealed | ✓ | ✓ |
| Weight | 0.54 kg | 0.42 kg★ |
| Filter Thread | 67 mm | 67 mm |
| AF & Stabilization | ||
| AF Type | HLA (High-response Linear Actuator) | Autofocus |
| Stabilization | ✗ | ✗ |
| Focus | ||
| Min Focus Distance | 280 mm | 180 mm★ |
| Max Magnification | 1:4.8★ | 0.26x |
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 Limited 28050 21mm
- Strong build (76th percentile)
- Strong optical (76th percentile)
- Strong user sentiment (66th percentile)
- Below average bokeh (19th percentile)19th %ile
- Below average aperture (22nd percentile)
- Below average versatility (33rd percentile)
- Below average stabilization (34th percentile)
Pricing
Sigma Art 17-40mm f/1.8 DC offers 2.5x better value for money
Verdict
Scores 97 overall, wins 9 of 9 usage categories and 3 of 21 specs.
