Sigma Art 17-40mm f/1.8 DC
IRIX Blackstone 15mm f/2.4 Blackstone 15mm
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
IRIX Blackstone 15mm f/2.4 Blackstone 15mm
The IRIX 15mm f/2.4 lens gets high marks for its sharpness, build quality, and value. Users love it for landscape and astrophotography, praising the weather sealing, filter use, and electronic aperture control. Some find the manual focus ring stiff, and there are occasional concerns about quality control and decentering.
Pros
- Excellent value for money
- Sharp image quality
- Great for astrophotography
- Weather-sealed design
- Electronic aperture control
Cons
- Stiff manual focus ring
- Occasional decentering issues
- Quality control concerns
- Tricky lens cap in the dark
- Infinity mark may be inaccurate
Scores
Specifications
| Sigma Art 17-40mm f/1.8 DC | IRIX Blackstone 15mm f/2.4 Blackstone 15mm | |
|---|---|---|
| Optics | ||
| Type | zoom | prime |
| Focal Length Min | 17 mm | 15 mm |
| Focal Length Max | 40 mm | 15 mm |
| Elements | 17 | 15 |
| Groups | 11 | 11 |
| Aspherical Elements | 4★ | 2 |
| ED Elements | 4★ | 2 |
| Coating | Super Multi-Layer Coating | Neutrino coating |
| Aperture | ||
| Max Aperture | f/1.8 | f/22 |
| Min Aperture | f/1.8 | f/2.4 |
| Constant | ✓★ | ✗ |
| Diaphragm Blades | 11★ | 9 |
| Build | ||
| Mount | Fujifilm X | Nikon F |
| Format | APS-C | full-frame★ |
| Weather Sealed | ✓ | ✓ |
| Weight | 0.54 kg★ | 0.69 kg |
| Filter Thread | 67 mm | 95 mm |
| AF & Stabilization | ||
| AF Type | HLA (High-response Linear Actuator) | manual focus only |
| Stabilization | ✗ | ✗ |
| Focus | ||
| Min Focus Distance | 280 mm | 280 mm |
| Max Magnification | 1:4.8 | 1:2 |
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)
IRIX Blackstone 15mm f/2.4 Blackstone 15mm
- Strong optical (86th percentile)86th %ile
- Strong macro (72nd percentile)
- Strong social proof (69th percentile)
- Below average af (15th percentile)15th %ile
- Below average aperture (22nd percentile)
- Below average bokeh (25th percentile)
- Below average versatility (33rd percentile)
Pricing
IRIX Blackstone 15mm f/2.4 Blackstone 15mm offers 1.3x better value for money
Verdict
Scores 97 overall, wins 9 of 9 usage categories and 5 of 21 specs.
