Canon RF-S 3.9mm F3.5 STM Dual Fisheye
Canon · 3.9 mm · f/3.5
Score Breakdown
Scores combine our editorial testing with published lab data.
46
SCORE /100
What We Like
+Single-sensor dual fisheye design eliminates multi-camera syncing and stitching complexity
+Sharp across entire image circle at f/3.5 with Air Sphere Coating reducing flare and ghosting
+Compact folded optical design at just 290g makes it extremely portable for travel
+144° wide field of view with 60mm interpupillary distance matches human vision for immersive 3D VR
+STM autofocus operates like standard RF lens for intuitive still shooting and pre-focus before video
+Affordable APS-C VR solution at $1,099-$1,299 vs $2,000+ for full-frame RF 5.2mm alternative
Worth Knowing
−Requires Canon EOS R7 firmware 1.5.0+ or R50 V for full VR functionality; limited camera compatibility
−No servo autofocus during video recording; manual focus or One-Shot AF required before filming
−144° field of view is narrower than full-frame RF 5.2mm (190°), resulting in less immersive VR experience
−Relies on Canon's subscription-based software (EOS VR Utility/Adobe Premiere Pro plugin) for VR file conversion and processing
General | |
|---|---|
About This LensThe Canon RF-S 3.9mm F3.5 STM Dual Fisheye features a folded optical design with separate left and right optical systems to capture stereoscopic 3D imagery with a 144° field of view to a single APS-C image sensor. The lens is sharp throughout the entire image circle at f/3.5 with little improvement through f/5.6. It is the first non-L series lens to feature Canon's Air Sphere Coating. Compared to the full-frame RF 5.2mm F2.8 L Dual Fisheye, the APS-C RF-S 3.9 is more affordable and designed for accessible VR content creation. | |
| Brand | Canon |
| Release Year | 2024 |
Production Status ⓘCurrent status of lens manufacturing (e.g., in production, discontinued). |  In Production |
Lens Mount ⓘThe lens mount will tell you what type of lens range you can fit onto the camera body. Often the same camera company will have different lens ranges for different cameras. | Canon RF-S |
System ⓘIndicates which camera system the lens is designed to attach to. | Canon EOS R (APS-C) |
Maximum Format ⓘLargest sensor size compatible with the lens. |  APS-C |
Physical50/100 | |
| Lens Weight | 290 g |
Lens Diameter ⓘWidth of the lens at its widest point | 112.1 mm |
Lens Length ⓘHow long the lens is from front to back. | 83.7 mm |
Front Filter Compatible ⓘSome lenses are compatible with front filters, some are compatible with back filters and some are compatible with both. Front filters are usually more convenient to add and remove. | No |
Optics65/100 | |
Focal Range ⓘShortest to longest focal length of the lens (zoom range start - end ) | 3.9 mm |
Aperture Range ⓘLargest aperture at the lens's shortest focal length to longest focal length (aperture range start - end) | 3.5 |
| Focal Length Angle of View | 144° |
Flange Focal Distance ⓘDistance from lens mount to sensor. | 20 mm |
Diaphragm Type ⓘStructure and design of the aperture |  Automatic |
Blades ⓘNumber of diaphragm blades in aperture | 7020 |
Zoom Lens ⓘZoom allows you to vary the focal length, change between long shots and close-ups | No |
Closest Focusing Distance ⓘMinimum distance for a subject to be in focus. | 20 cm01500 |
Maximum Magnification ⓘLargest size a subject can be reproduced | 0.03x |
| Autofocus Mode |  Yes |
| Manual Mode |  Yes |
| Manual Focusing Ring |  Yes |
Features | |
Weather Sealing ⓘWeather sealing capabilities will give you more confidence when shooting in unfavourable conditions. | No |
Fluorine Coating ⓘCoating to repel water and oil from lens elements. | No |
| Built In Lens Hood | No |
Teleconverter ⓘA teleconverter (extender) is an extra piece of equipment that fits between the lens and the camera body to enhance magnification | No |
| Image Stabilization | No |
Construction38/100 | |
Elements ⓘLens elements refer to individual pieces of glass within the lens. | 11 |
| Groups | 8 |
Aspherical Elements ⓘThe number of aspherical lens elements which can help correct aberrations such as spherical aberration. | 0 |
Bi Aspherical Elements ⓘElements with two non-spherical surfaces | 0 |
Low Dispersion ⓘElements that reduce chromatic aberration | 2 |
Super Low Dispersion ⓘAdvanced elements further reducing chromatic aberration | 0 |
CA Reduction ⓘBuilt-in features to reduce chromatic aberration | 0 |
Internal Focusing ⓘInternal Focusing means that the lens does not change in size during focusing, and the front element does not rotate. |  Yes |