Sigma Art 17-40mm f/1.8 DC
Pentax DA* 12345 18mm
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* 12345 18mm
The Pentax HD DA 11-18mm f/2.8 ED DC AW* is overwhelmingly praised for its exceptional sharpness, build quality, and versatility across landscape, astrophotography, and portrait work. Verified users report it becoming their go-to lens on K-3 and K-1 bodies, delivering images that rival or exceed competitors like the Sigma 10-20. Minor issues include incompatibility with some filter holders and a high price, but the overall sentiment is highly positive.
Pros
- Exceptional sharpness
- High build quality
- Versatile for landscape and astro
- Fast f/2.8 aperture
- Filter mount compatibility
Cons
- Filter holder incompatibility
- High price
Scores
Specifications
| Sigma Art 17-40mm f/1.8 DC | Pentax DA* 12345 18mm | |
|---|---|---|
| Optics | ||
| Type | zoom | zoom |
| Focal Length Min | 17 mm | 11 mm |
| Focal Length Max | 40 mm | 18 mm |
| Elements | 17 | 16 |
| Groups | 11 | 11 |
| Aspherical Elements | 4★ | 2 |
| ED Elements | 4★ | 2 |
| Coating | Super Multi-Layer Coating | Aero Bright II Coating, Super Protect Coating |
| Aperture | ||
| Max Aperture | f/1.8 | f/22 |
| Min Aperture | f/1.8 | f/2.8 |
| Constant | ✓ | ✓ |
| Diaphragm Blades | 11★ | 9 |
| Build | ||
| Mount | Fujifilm X | Pentax K |
| Format | APS-C | APS-C |
| Weather Sealed | ✓ | ✓ |
| Weight | 0.54 kg★ | 0.70 kg |
| Filter Thread | 67 mm | 82 mm |
| AF & Stabilization | ||
| AF Type | HLA (High-response Linear Actuator) | DC |
| Stabilization | ✗ | ✗ |
| Focus | ||
| Min Focus Distance | 280 mm★ | 300 mm |
| Max Magnification | 1:4.8 | 1:10 |
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* 12345 18mm
- Strong optical (87th percentile)87th %ile
- Strong user sentiment (82nd percentile)82nd %ile
- Strong macro (69th percentile)
- Strong versatility (67th percentile)
- Below average aperture (22nd percentile)
- Below average bokeh (25th percentile)
- Below average stabilization (34th percentile)
Verdict
Scores 96 overall, wins 9 of 9 usage categories and 5 of 21 specs.