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Canon RF-S | EOS VR System
Canon RF-S3.9mm F3.5 STM Dual Fisheye | 3D VR Lens
Create immersive stereoscopic VR content with the Canon RF-S3.9mm F3.5 STM Dual Fisheye, a specialized APS-C lens designed to simplify virtual reality production with one compatible EOS R-series camera. Its paired fisheye optics capture 144° 3D stereoscopic imagery using the parallax between the left and right lenses while both optical paths project onto a single image sensor.
With dual-lens STM autofocus, a bright F3.5 aperture, synchronized optical movement, adjustable focus differential and a rear filter system, the RF-S3.9mm is built around a streamlined EOS VR workflow rather than conventional single-lens photography.
144°Angle of View
3.9mmDual Fisheye
F3.5Maximum Aperture
290gApprox. Lens Weight
Jump to What Matters
At a Glance
Canon RF-S3.9mm F3.5 STM Dual Fisheye Key Highlights
- 144° angle of view for stereoscopic VR capture
- Dual fisheye optical design for left/right stereoscopic imagery
- Both optical paths use a single compatible image sensor
- Dual-lens STM autofocus with synchronized lens movement
- Bright F3.5 maximum aperture
- Adjustable focus differential between the two lenses
- Dual-lens electromagnetic diaphragm system
- Air Sphere Coating helps suppress flare and ghosting
- Rear filter holder supports gelatin and 30.5mm screw-on filters
- Designed for Canon’s EOS VR production workflow
- Approx. 290g without rear filter holder
- Compatible with designated EOS R-series APS-C cameras
EOS VR Concept
How the Canon RF-S3.9mm Creates 3D VR Images
The RF-S3.9mm uses two fisheye lenses positioned side by side to create the parallax needed for stereoscopic imagery. Each lens observes the scene from a slightly different viewpoint, reproducing the visual difference between the left and right eyes.
Instead of requiring two separate cameras, the RF-S3.9mm directs the optical information from both lenses onto one image sensor. Canon’s EOS VR workflow can then convert the captured circular fisheye imagery into an equirectangular format suitable for immersive VR production.
Important Distinction
The lens itself has a specified 144° angle of view. That optical specification should not be confused with the broader immersive viewing format used by VR software and head-mounted displays. The RF-S3.9mm is designed as part of Canon’s EOS VR stereoscopic workflow.
Two Fisheye LensesLeft and right optical paths provide the different viewpoints required for stereoscopic depth.
Single SensorBoth optical paths are recorded through one compatible camera sensor.
ParallaxThe small viewpoint difference between the lenses contributes to the stereoscopic 3D effect.
VR ConversionEOS VR software converts the captured fisheye imagery into an equirectangular projection for immersive viewing.
Simplified Capture
One Camera, Two Optical Views and a Streamlined VR Workflow
Traditional stereoscopic production can require two cameras, careful physical alignment, synchronized recording, matching exposure and color settings, and additional stitching work. The RF-S3.9mm is designed to consolidate the optical capture stage into a single compatible camera system.
Dual Optical Capture
The left and right fisheye lenses simultaneously capture different viewpoints of the same scene.
Single-Sensor Recording
Both optical paths are recorded through the camera’s single image sensor, reducing the need for two-camera synchronization.
Software Conversion
EOS VR software converts the circular fisheye imagery into the equirectangular format required for immersive VR production.
HMD Viewing
The processed VR footage can be prepared for viewing on compatible head-mounted displays and other supported immersive platforms.
Autofocus & Precision
Dual-Lens STM Autofocus with Synchronized Movement
One of the defining features of the RF-S3.9mm is its dual-lens STM autofocus mechanism. The left and right lenses are designed to move together so the two optical paths can maintain the focus relationship required for stereoscopic recording.
A dedicated microprocessor helps optimize actuator control in conjunction with the camera’s autofocus algorithm. The result is a lens system designed specifically around synchronized dual-lens focusing rather than conventional single-optical-path autofocus.
Gear-Type STMThe focusing mechanism uses a gear-type stepping motor system.
Dual-Lens AFThe left and right optical systems are controlled as part of one coordinated autofocus mechanism.
Microprocessor ControlActuator operation is optimized through dedicated processing and the camera’s AF control system.
Stereoscopic Precision
Adjustable Focus Differential for Left and Right Views
Stereoscopic capture depends on maintaining an appropriate relationship between the left and right images. The RF-S3.9mm therefore includes an adjustable focus differential function.
The system allows the right lens to be driven independently when required, providing an additional adjustment point for situations where the focus relationship between the two optical paths needs refinement.
Why It Matters
Dual-lens VR optics are not simply two ordinary lenses placed side by side. Their focus relationship directly affects the stereoscopic result. The adjustable differential gives the operator additional control over that relationship.
Exposure Control
Bright F3.5 Aperture with Dual-Lens Electromagnetic Diaphragm
The RF-S3.9mm provides a maximum aperture of F3.5, giving the lens a useful amount of light-gathering capability for immersive content production across indoor, controlled and available-light environments.
Canon also uses a dual-lens electromagnetic diaphragm (EMD) system. Coordinated aperture control is important in stereoscopic production because the left and right optical paths need to maintain consistent exposure characteristics.
Maximum ApertureF3.5 for the RF-S3.9mm’s dual-fisheye optical system.
Minimum ApertureF16.
Diaphragm7-blade diaphragm construction.
Dual-Lens EMDElectromagnetic diaphragm control is designed around the two-lens system.
Optical Design
Dual Fisheye Optics with Air Sphere Coating
The RF-S3.9mm uses a compact 8-group, 11-element optical construction developed specifically for its dual-fisheye VR application.
Canon’s Air Sphere Coating (ASC) is incorporated to help suppress flare and ghosting caused by unwanted internal reflections. This is particularly relevant when shooting immersive scenes containing bright light sources or high-contrast illumination.
8 Groups / 11 Elements
The optical construction is designed specifically around the compact dual-fisheye configuration.
Air Sphere Coating
ASC helps reduce unwanted flare and ghosting to support cleaner image rendering in challenging lighting.
144° View
The specified diagonal, horizontal and vertical angle of view is 144°00′.
Close Focusing
Minimum focusing distance is 0.2m / 0.66ft.
Filter Compatibility
Rear Filter Holder for 30.5mm and Gelatin Filters
Because of the extremely wide dual-fisheye optical design, the RF-S3.9mm uses a rear filter system rather than a conventional front-mounted filter arrangement.
The rear filter holder accepts compatible gelatin filters and supports 30.5mm screw-on filters. This makes it possible to integrate ND filtration into the lens setup when exposure control is required for bright environments or specific production conditions.
130.5mm Screw-On Filter
2Gelatin Filter Support
3Rear Filter Position
4ND Filter Use Supported
Production Workflow
From Dual Fisheye Capture to Equirectangular VR
The RF-S3.9mm is designed to work as part of Canon’s EOS VR ecosystem. Instead of treating the lens as a conventional fisheye lens, the production workflow takes the paired circular images and processes them into an immersive format.
Capture
Record the scene using the RF-S3.9mm mounted on a compatible EOS R-series camera.
Convert
EOS VR Utility converts the circular fisheye source into an equirectangular projection.
Correct
Supported tools provide options for left/right image swapping, straightening and parallax correction.
Export
The processed material can be prepared for supported VR, editing and spatial-video workflows.
EOS VR Utility
EOS VR Utility for Conversion, Correction and Export
Canon’s EOS VR Utility provides the software stage that turns the RF-S3.9mm’s dual-fisheye capture into usable immersive footage. Depending on the supported workflow and software version, the utility provides tools for conversion, viewing, correction and export.
Fisheye to EquirectangularConvert the circular fisheye source into an equirectangular projection.
Left / Right SwitchingToggle the left and right optical views where required.
StraighteningCorrect the orientation of the immersive image.
Parallax CorrectionRefine the relationship between the two stereoscopic views.
Playback & Basic CuttingReview and perform supported basic editing operations on VR material.
Advanced ExportSupported workflows include high-resolution conversion/export and professional output options.
Current Software Direction
Canon’s current EOS VR Utility development also supports newer spatial and immersive workflows, including supported exports for spatial viewing platforms. Software capabilities can vary by operating system, camera, lens and application version, so the current Canon software documentation should be checked before a production workflow is finalized.
Professional Editing
EOS VR Plugin for Adobe Premiere Pro
For editors working inside Adobe Premiere Pro, Canon’s EOS VR workflow can be extended through the EOS VR Plugin. This allows supported operations to be incorporated into a familiar professional post-production environment.
- Left/right view switching
- Equirectangular conversion
- Straightening and parallax correction
- Integration into a professional Premiere Pro editing workflow
- Additional advanced functions may depend on the current software version, subscription and project requirements
Software note: Canon’s software capabilities and licensing requirements can change over time. Verify the current EOS VR Utility and EOS VR Plugin requirements before starting a commercial production workflow.
Camera Compatibility
Designed for Compatible Canon EOS R-Series Cameras
The RF-S3.9mm is an APS-C RF-mount VR lens and is designed for use with compatible Canon EOS R-series cameras. Canon has specifically expanded compatibility to designated cameras as firmware and camera support have developed.
Compatibility Check
The EOS R7 is a key camera for the RF-S3.9mm workflow. Canon also announced compatibility with the EOS R50 V from June 2025. Camera compatibility and required firmware should always be confirmed against Canon’s latest support documentation before purchase or a professional shoot.
| Camera / System | RF-S3.9mm Workflow | Important Note |
|---|---|---|
| Canon EOS R7 | Supported | Use the required/current Canon firmware for RF-S3.9mm support. |
| Canon EOS R50 V | Supported | Compatibility announced by Canon from June 2025. |
| Other RF-S compatible cameras | Check Canon documentation | Do not assume compatibility simply because the camera has an RF mount. |
Who Is It For?
Who Should Consider the Canon RF-S3.9mm F3.5 STM Dual Fisheye?
VR Content CreatorsIdeal for creators producing stereoscopic immersive experiences with a compatible Canon camera.
Real Estate & ArchitectureUseful for immersive property experiences where viewers need a stronger sense of spatial presence.
Tourism & TravelSuitable for destinations, museums, cultural spaces and immersive travel storytelling.
Education & TrainingA practical platform for immersive educational environments, demonstrations and training experiences.
Events & ExperiencesUseful when the goal is to place the viewer inside an event or environment rather than simply show conventional video.
Professional VR ProductionParticularly relevant to teams wanting to simplify the camera side of a stereoscopic capture workflow.
Before You Buy
Important Things to Know Before Buying the RF-S3.9mm
It Is a Specialized VR Lens
This is not a conventional ultra-wide lens for ordinary photography. Its primary purpose is stereoscopic VR capture using Canon’s EOS VR production workflow.
Camera Compatibility Matters
An RF mount alone does not guarantee that every EOS R-series camera can use every RF-S3.9mm feature. Confirm the camera model and firmware before ordering.
Software Is Part of the System
The lens is only one part of the production workflow. EOS VR software is required for converting and preparing the dual-fisheye footage.
Plan the Viewing Platform
Decide where the finished content will be viewed before production. VR headsets, spatial-video platforms and conventional screens can have different delivery requirements.
Technical Reference
Canon RF-S3.9mm F3.5 STM Dual Fisheye Full Specifications
The specifications below summarize the official Canon technical information for the RF-S3.9mm F3.5 STM Dual Fisheye lens.
General & Optical Specifications
| Lens Type | Dual Fisheye / 3D VR lens |
|---|---|
| Lens Mount | Canon RF-S / RF mount system |
| Focal Length | 3.9mm |
| Maximum Aperture | F3.5 |
| Minimum Aperture | F16 |
| Angle of View | 144°00′ diagonal / horizontal / vertical |
| Lens Construction | 8 groups, 11 elements |
| Diaphragm Blades | 7 |
| Maximum Magnification | 0.03× |
Focusing & Autofocus
| Drive System | Gear-type STM |
|---|---|
| Autofocus | Dual-lens STM autofocus |
| Focus Control | Synchronized left/right lens movement |
| Focus Differential | Adjustable; right lens can be independently driven |
| Closest Focusing Distance | 0.2m / 0.66ft |
Filter, Coating & Physical Construction
| Filter System | Rear filter holder |
|---|---|
| Screw-On Filter | 30.5mm |
| Gelatin Filter | Supported through rear holder |
| Coating | Air Sphere Coating (ASC) |
| Anti-Dust / Moisture Resistance | Not supported |
| Lens Hood | Not supported |
Dimensions, Weight & Included Accessories
| Dimensions | 112.0 × 83.7 × 54.6mm |
|---|---|
| Weight | Approx. 290g without rear filter holder |
| Lens Cap | Canon Lens Cap 3.9, center pinch |
| Dust Cap | Lens Dust Cap RF |
| Lens Bag | LS1014, sold separately |
Canon RF-S Ecosystem
Explore Related Canon RF-S Lenses
The RF-S3.9mm belongs to a wider Canon RF-S lens ecosystem. If your work includes conventional APS-C photography and video alongside VR production, these related lenses cover a broader range of focal lengths and applications.
Canon RF-S7.8mm F4 STM Dual
A related dual-lens VR solution for Canon’s APS-C RF system, designed for a different immersive capture application.
Canon RF-S10-18mm
A conventional ultra-wide APS-C zoom for landscape, architecture, travel and video applications.
Canon RF-S18-150mm
A versatile all-purpose APS-C zoom covering wide-angle through telephoto perspectives.
Canon RF-S55-210mm
A compact APS-C telephoto zoom for distant subjects, portraits, sports and travel.
Dual Fisheye Comparison
Canon RF-S3.9mm vs RF-S7.8mm Dual Fisheye
Canon’s dual-fisheye lineup includes different optical approaches for stereoscopic and immersive content. The following table highlights the principal published specifications relevant to choosing between the two systems.
| Feature | RF-S3.9mm F3.5 STM | RF-S7.8mm F4 STM |
|---|---|---|
| Optical Type | Dual Fisheye | Dual Fisheye |
| Focal Length | 3.9mm | 7.8mm |
| Maximum Aperture | F3.5 | F4 |
| Primary Concept | EOS VR stereoscopic capture | Dual-lens immersive capture |
| Focus System | Dual-lens STM autofocus | STM-based dual optical system |
| RF-S System | Yes | Yes |
Specifications and compatibility can vary by camera body, firmware and software generation. Confirm the current Canon documentation for the exact production combination you intend to use.
Complete Creator Setup
Building a Canon EOS VR Production Setup
The RF-S3.9mm is best understood as one component of a complete immersive production system. The camera, lens, firmware, storage, filters, software and viewing platform all contribute to the final result.
Compatible EOS R Camera
Start with a Canon camera officially compatible with the RF-S3.9mm and ensure the required firmware is installed.
RF-S3.9mm Dual Fisheye
Use the lens as the stereoscopic capture system, keeping both optical paths properly focused and configured.
Rear ND Filtration
Consider compatible rear ND filtration when working under bright conditions and when your exposure workflow requires it.
EOS VR Utility
Process the dual-fisheye source, correct the imagery and prepare the output for your intended viewing or editing platform.
Buying Guide
Canon RF-S3.9mm Price in Pakistan & Buying Considerations
If you are searching for the Canon RF-S3.9mm F3.5 STM Dual Fisheye price in Pakistan, remember that this is a specialized EOS VR lens rather than a mainstream photographic lens. Availability can therefore be more limited and pricing may vary between authorized channels, specialist camera dealers and imported stock.
Check Exact Model
Make sure the listing is specifically for the RF-S3.9mm F3.5 STM Dual Fisheye and not another Canon dual-fisheye or RF-S lens.
Confirm Compatibility
Confirm that your Canon camera is officially supported and has the appropriate firmware for the lens and EOS VR workflow.
Ask About Warranty
For a specialized lens, verify whether the supplied unit carries official/local warranty coverage or dealer warranty.
Confirm Included Accessories
Check the exact package contents, rear filter holder, caps and any separately sold accessories before completing the purchase.
Frequently Asked Questions
Canon RF-S3.9mm F3.5 STM Dual Fisheye FAQ
What is the Canon RF-S3.9mm F3.5 STM Dual Fisheye used for?
It is a specialized dual-fisheye lens designed for stereoscopic virtual reality capture with compatible Canon EOS R-series cameras. It captures left and right viewpoints through a single camera sensor for Canon’s EOS VR workflow.
What is the angle of view of the RF-S3.9mm?
The RF-S3.9mm has a specified diagonal, horizontal and vertical angle of view of 144°00′.
Does the RF-S3.9mm use two sensors?
No. The lens uses two fisheye optical paths while the captured light from both lenses is recorded through one compatible image sensor.
Does the RF-S3.9mm have autofocus?
Yes. It uses a dual-lens STM autofocus mechanism designed to coordinate the movement of the left and right lenses.
What is the maximum aperture?
The maximum aperture is F3.5.
What filter size does the RF-S3.9mm use?
The lens uses a rear filter holder that supports 30.5mm screw-on filters as well as compatible gelatin filters.
What is the closest focusing distance?
The closest focusing distance is approximately 0.2m / 0.66ft.
How much does the RF-S3.9mm weigh?
The lens weighs approximately 290g without the rear filter holder.
Is the RF-S3.9mm weather sealed?
Canon’s published specification does not list anti-dust or moisture-resistant construction for this lens.
Does the RF-S3.9mm work with the Canon EOS R7?
Yes. The EOS R7 is a designated compatible camera for the RF-S3.9mm EOS VR workflow. The required/current camera firmware should be checked with Canon before use.
Does the RF-S3.9mm work with the Canon EOS R50 V?
Canon announced RF-S3.9mm compatibility with the EOS R50 V from June 2025. Always confirm the latest firmware and software requirements before production.
Do I need EOS VR software to use the lens?
For the intended EOS VR production workflow, yes. Canon’s EOS VR Utility and supported EOS VR software tools are used to convert and process the dual-fisheye imagery into formats suitable for immersive viewing and editing.
