BM Premium 420mm Lens 420-800mm
Sigma Art 17-40mm f/1.8 DC
What Buyers Say
BM Premium 420mm Lens 420-800mm
The lens receives mixed feedback: some users praise its value for money and image quality for certain uses like architecture, but many report serious issues including incompatibility with Canon EOS R8, poor image quality, flimsy plastic build, and slow autofocus unsuitable for wildlife. The need for a tripod due to bulkiness and manual focus annoyance are also noted.
Pros
- Good value for money
- Decent image quality for architecture
- Pleasant for certain projects
Cons
- Incompatible with Canon EOS R8
- Poor image quality
- Flimsy plastic zoom mechanism
- Slow autofocus for wildlife
- Bulky requiring tripod
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
Scores
Specifications
| BM Premium 420mm Lens 420-800mm | Sigma Art 17-40mm f/1.8 DC | |
|---|---|---|
| Optics | ||
| Type | telephoto | zoom |
| Focal Length Min | 420 mm | 17 mm |
| Focal Length Max | 1600 mm | 40 mm |
| Elements | — | 17 |
| Groups | — | 11 |
| Aspherical Elements | — | 4★ |
| ED Elements | — | 4★ |
| Coating | multi-coated | Super Multi-Layer Coating |
| Aperture | ||
| Max Aperture | f/8.3 | f/1.8 |
| Min Aperture | f/8.3 | f/1.8 |
| Constant | ✓ | ✓ |
| Diaphragm Blades | — | 11★ |
| Build | ||
| Mount | Canon RF | Fujifilm X |
| Format | — | APS-C★ |
| Weather Sealed | — | ✓★ |
| Weight | 1.14 kg | 0.54 kg★ |
| Filter Thread | 62 mm | 67 mm |
| AF & Stabilization | ||
| AF Type | manual focus only | HLA (High-response Linear Actuator) |
| Stabilization | ✓★ | ✗ |
| Focus | ||
| Min Focus Distance | 420 mm | 280 mm★ |
| Max Magnification | — | 1:4.8★ |
Pros & Cons
BM Premium 420mm Lens 420-800mm
- Strong versatility (86th percentile)86th %ile
- Strong stabilization (79th percentile)
- Below average user sentiment (1st percentile)1st %ile
- Below average build (14th percentile)14th %ile
- Below average af (15th percentile)15th %ile
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)
Pricing
BM Premium 420mm Lens 420-800mm offers 4.2x better value for money
Verdict
Scores 97 overall, wins 9 of 9 usage categories and 8 of 21 specs.
