Viltrox AF 9mm F2.8 XF 9mm
Canon RF-S 3.9mm f/3.5 STM Dual Fisheye 4mm
What Buyers Say
Viltrox AF 9mm F2.8 XF 9mm
The Viltrox lenses receive overwhelmingly positive feedback for their exceptional value, sharp image quality, and solid build. Users praise the fast apertures and autofocus performance, though some note issues with chromatic aberration in high-contrast scenes and noisy autofocus on certain models. Overall, these lenses are seen as a budget-friendly alternative that punches above their price point.
Pros
- Excellent value for money
- Sharp image quality wide open
- Solid metal construction
- Fast and accurate autofocus
- Pleasing bokeh
Cons
- Chromatic aberration in high contrast
- Noisy autofocus in video
- Slow autofocus in low light
- No weather sealing
- Front-heavy on small bodies
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
Scores
Specifications
| Viltrox AF 9mm F2.8 XF 9mm | Canon RF-S 3.9mm f/3.5 STM Dual Fisheye 4mm | |
|---|---|---|
| Optics | ||
| Type | wide-angle | fisheye |
| Focal Length Min | 9 mm | 4 mm |
| Focal Length Max | 9 mm | 4 mm |
| Elements | 13 | 11 |
| Groups | 11 | 8 |
| Aspherical Elements | 2★ | — |
| ED Elements | 3★ | 2 |
| Coating | HD multilayer nano coating | Air Sphere Coating |
| Aperture | ||
| Max Aperture | f/2.8 | f/16 |
| Min Aperture | f/2.8 | f/3.5 |
| Constant | ✓★ | ✗ |
| Diaphragm Blades | 7 | 7 |
| Build | ||
| Mount | Fujifilm X | Canon RF |
| Format | APS-C | APS-C |
| Weather Sealed | ✗ | ✗ |
| Weight | 0.17 kg★ | 0.29 kg |
| Filter Thread | 58 mm | 31 mm |
| AF & Stabilization | ||
| AF Type | STM | STM |
| Stabilization | ✓★ | ✗ |
| Focus | ||
| Min Focus Distance | 130 mm★ | 201 mm |
| Max Magnification | 1:6.66 | 1:33.33 |
Pros & Cons
Viltrox AF 9mm F2.8 XF 9mm
- Strong macro (89th percentile)89th %ile
- Strong build (87th percentile)87th %ile
- Strong social proof (86th percentile)86th %ile
- Strong aperture (86th percentile)86th %ile
- Below average versatility (34th percentile)
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)
Verdict
Scores 93 overall, wins 9 of 9 usage categories and 6 of 21 specs.