Canon RF-S 3.9mm f/3.5 STM Dual Fisheye 4mm
Sigma Art 24-70mm F2.8 DG DN Art
What Buyers Say
Canon RF-S 3.9mm f/3.5 STM Dual Fisheye 4mm
The Canon RF-S 3.9mm f/3.5 STM Dual Fisheye Lens receives mixed feedback. One verified user reports a critical autofocus bug that requires a camera reset to fix, and incompatibility with Canon VR Utility for equirectangular conversion. Another verified owner finds it a good, affordable, lightweight alternative to the Canon R5 setup with autofocus. A third unverified user praises it for VR video, calling it a 10/10 purchase for wedding videography.
Pros
- Affordable alternative to R5 setup
- Lightweight design
- Autofocus capability
- Great for VR video
- Good for wedding videography
Cons
- Frequent autofocus loss requiring camera reset
- Incompatible with Canon VR Utility
- Limited compatibility (only R7 confirmed)
- No screw-on ND filter options
- Autofocus only on left lens subject
Sigma Art 24-70mm F2.8 DG DN Art
The Sigma 24-70mm f/2.8 Art lens receives largely positive feedback for its sharp optics, solid build, and excellent value compared to OEM alternatives. Many users praise its image quality, especially in the center, and appreciate the included image stabilization. However, some reviewers report inconsistent autofocus, requiring micro-adjustments or the USB dock for calibration, and note that the lens is significantly heavy. A few copies exhibited soft corners or front/back focus issues.
Pros
- Sharp optics
- Solid build quality
- Great value for money
- Effective image stabilization (OS)
- Fast and quiet autofocus
Cons
- Heavy weight
- Inconsistent autofocus
- Soft corners at some focal lengths
- Needs micro-adjustment or USB dock for calibration
- Front/back focus issues on some copies
Scores
Specifications
| Canon RF-S 3.9mm f/3.5 STM Dual Fisheye 4mm | Sigma Art 24-70mm F2.8 DG DN Art | |
|---|---|---|
| Optics | ||
| Type | fisheye | zoom |
| Focal Length Min | 4 mm | 24 mm |
| Focal Length Max | 4 mm | 70 mm |
| Elements | 11 | 19 |
| Groups | 8 | 15 |
| Aspherical Elements | — | 4★ |
| ED Elements | 2 | 3★ |
| Coating | Air Sphere Coating | Super Multi-Layer Coating |
| Aperture | ||
| Max Aperture | f/16 | f/2.8 |
| Min Aperture | f/3.5 | f/2.8 |
| Constant | ✗ | ✓★ |
| Diaphragm Blades | 7 | 9★ |
| Build | ||
| Mount | Canon RF | Sony E |
| Format | APS-C | full-frame★ |
| Weather Sealed | ✗ | ✓★ |
| Weight | 0.29 kg★ | 1.02 kg |
| Filter Thread | 31 mm | 82 mm |
| AF & Stabilization | ||
| AF Type | STM★ | HSM |
| Stabilization | ✗ | ✓★ |
| Stabilization Stops | — | 4 stops★ |
| Focus | ||
| Min Focus Distance | 201 mm | 170 mm★ |
| Max Magnification | 1:33.33 | 1:2.7 |
Pros & Cons
Canon RF-S 3.9mm f/3.5 STM Dual Fisheye 4mm
- Strong af (85th percentile)85th %ile
- Strong macro (81st percentile)81st %ile
- Strong build (76th percentile)
- Below average user sentiment (2nd percentile)2nd %ile
- Below average social proof (26th percentile)
- Below average bokeh (30th percentile)
- Below average versatility (34th percentile)
Sigma Art 24-70mm F2.8 DG DN Art
- Strong optical (98th percentile)98th %ile
- Strong social proof (94th percentile)94th %ile
- Strong stabilization (93rd percentile)93rd %ile
- Strong bokeh (89th percentile)89th %ile
Pricing
Sigma Art 24-70mm F2.8 DG DN Art offers 2.0x better value for money
Verdict
Scores 97 overall, wins 9 of 9 usage categories and 9 of 22 specs.
