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Canon RF-S 3.9mm F3.5 STM Dual Fisheye
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Canon · 3.9 mm · f/3.5 · Canon RF mount

Canon RF-S 3.9mm F3.5 STM Dual Fisheye

KEY FACTS
BrandCanon
Announcement dateJun 2024
Released2024
Production started2024
Production statusIn Production
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

Brand
Canon
Announcement date
ⓘ
Refers to the date the manufacturer publicly announced the upcoming release and general specs of this camera.
Jun 2024
Released
ⓘ
Refers to the year this camera was officially made available for sale.
2024
Production started
2024
Production status
ⓘ
Current status of lens manufacturing (e.g., in production, discontinued).
In Production
Read our notes on general
The 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.

Optical

Full Frame Equivalent
6.24mm (APS-C with 1.6x crop factor)
Lens Type
Dual Fisheye Prime
Field of View
144°
Minimum Aperture
f/16
Optical Elements
11 elements in 8 groups
Special Elements
2x UD (Ultra Low Dispersion) glass elements
Interpupillary Distance
60mm
Baseline Length
60mm

Coatings

Lens Coating
ASC (Air Sphere Coating)
Fluorine Coating
No

Autofocus

AF System
STM (Stepping Motor)
Servo AF
Not available
Focus Ring
Electronic focus/control ring with left-right focus adjustment

Aperture

Rounded Diaphragm Blades
No

Focus

Maximum Magnification
0.03x

Filters

Filter Diameter
30.5mm rear-mounted
Filter Thread
Screw-type 30.5mm rear filter mount
Gelatin Filter Support
Yes, built-in rear filter holder (27.3 x 27.3mm)

Mount construction

Mount Material
Metal
Optical Design
Folded optical design
Dust/Moisture Resistance
No
Image Stabilization
No

Physical

Included Accessories
Lens Cap 3.9, Lens Dust Cap RF, Rear Filter Holder, LS1014 Soft Lens Case
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
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
Lens weight
290 g

Compatibility

Compatible Cameras
Canon EOS R7 (firmware 1.5.0+), Canon EOS R50 V
Video Recording
4K 30p (EOS R7); 6K oversampled to 4K 30p (EOS R50 V)

Performance

Sharpness
Sharp throughout entire image circle at f/3.5
Projection Type
Equidistant projection

Vr software

VR Capability
Stereoscopic 3D 180° VR capture to single sensor
Magic Window Feature
Yes, on-screen overlay for composition assist
Compatible Software
EOS VR Utility, EOS VR Plug-in for Adobe Premiere Pro

Optics

Min focal length
3.9 mm
Max focal length
3.9 mm
Focal range
ⓘ
Shortest to longest focal length of the lens (zoom range start - end )
3.9 mm
Zoom lens
ⓘ
Zoom allows you to vary the focal length, change between long shots and close-ups
No
Max aperture wide
3.5
Max aperture zoom
3.5
Autofocus mode
Yes
Blades
ⓘ
Number of diaphragm blades in aperture
7020
Closest focusing distance
ⓘ
Minimum distance for a subject to be in focus.
20 cm01500

Features

Weather sealing
ⓘ
Weather sealing capabilities will give you more confidence when shooting in unfavourable conditions.
No