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The Flex 3 camera offers integrated image capture, processing, and motion tracking in a powerful, compact package. Customize your camera with user-changeable M12 lenses, black or red case treatments, and OptiTrack's exclusive Filter Switcher technology. Scalable, modular, and a fraction of the price you would expect—Flex 3 cameras deliver the world's premier optical tracking value proposition.

Flex 3 Guided Tour
Watch the Guided Tour

Take a journey deep into the Flex 3 as we highlight features along the way.

Speed - 100 FPS

Fast, precise, and efficient tracking

The Flex 3 is capable of capturing fast moving objects with its global shutter imager and 100 FPS capture speed. By maximizing its 640 × 480 VGA resolution through advanced image processing algorithms, the Flex 3 can also track markers down to sub-millimeter movements with repeatable accuracy.

Grayscale imaging mode Object imaging mode Segment imaging mode

Precision Grayscale | Object | Segment

Precision Grayscale (orange) vs. Segment (green)

On-camera image processing

The Flex 3 can send a variety of pre-processed image types to your PC, resulting in decreased bandwidth and CPU load, and more efficient motion tracking. Image processing types include:

  • Precision grayscale - Most precise marker detection. The Flex 3's default processing type. Sends grayscale marker information to the PC for calculation of object location, size, and roundness using our most precise processing methods. Provides greater accuracy than other modes, but consumes more CPU resources and USB bandwidth.
  • Segment - Balanced marker detection. Similar to Precision Grayscale, Segment processing streamlines marker information for more CPU-efficient marker detection. Provides a balance between precision and USB bandwidth use.
  • Object - The most CPU-efficient marker detection. Provides more efficient USB bandwidth utilization, but delivers less marker information to the PC than other modes.
  • MJPEG-compressed grayscale - Full resolution grayscale frames, compressed on-camera for highly scalable scene video capabilities.
  • Raw grayscale - Full resolution, uncompressed grayscale.
Camera Control

Camera control

Access a variety of Flex 3 settings with any of OptiTrack’s software applications, such as the Camera SDK, for greater control over what your cameras capture and what information they report to the PC. Available settings include:

  • Image processing type
  • Frame rate
  • Exposure
  • Threshold
  • Illumination
  • Filter switching
  • Status LED control
  • And more...

MJPEG compression

New in the Flex 3, MJPEG compression consumes 1/10th the bandwidth of uncompressed video while still enabling real-time grayscale video at full frame rate and full resolution (up to 100 FPS and 640 × 480 with Flex 3 cameras). Compact, high-quality grayscale video enables image preview with multiple cameras, simultaneously–an indispensable tool for camera aiming and focusing during rig setup and calibration.

Grayscale Video Access

Grayscale video access

Access raw and MJPEG-compressed grayscale video to transform any Flex 3 into a high-speed scene camera. Simplify camera aiming and calibration, optimize skeleton configuration, provide live capture feedback, and improve post-capture cleanup with a variety of grayscale video options.

Calibrated scene video

Because Flex 3 cameras can operate in grayscale mode, any of the cameras in your volume can be transformed back into a scene camera after calibration, enabling scene video that has exact position and orientation relative to the tracking volume.

Improved skeleton definition

Once scene cameras are calibrated within the volume, you can visually preview potential flaws for a higher level of accuracy. Simply compare the calibrated scene video with overlaid points to confirm that the skeleton aligns with the actor’s body segments and corresponding markers.

Real-time tracking feedback

Monitor the relationship between the actor and skeleton to confirm accurate tracking or to quickly diagnose unexpected behavior. Grayscale scene video is particularly useful during facial motion capture, offering high quality previs for feedback and presentation.

3D overlay

Record MJPEG grayscale footage at up to 100 frames per second—4x faster than normal film playback speed. High-speed recording enables the correlation of scene video and tracking data on a frame-by-frame basis for precise analysis or cleanup in post.

Watch the Filter Switcher Guided Tour

Filter Switcher technology

Toggle your camera between capturing infrared or visible light with a single mouse-click. Swap your Flex 3’s 800nm pass filter out on the fly to access visible spectrum grayscale video for enhanced image quality whenever reference video is required.

Solenoid-driven, software-controlled

Flex 3 cameras are equipped with a solenoid that can be controlled in-software to extend or retract the infrared lens filter. OptiTrack's custom polychromatic M12 lenses are specially designed to remain in focus in both the visible and infrared spectrums.

Enhanced scene illumination

Utilize environmental lighting—including standard fluorescent lights—to illuminate your scene for brighter lighting throughout large volumes.

Improved scene video recording and live presentation

Replace high contrast, infrared lighting with natural, visible light for more balanced and visually appealing scene video—ideal for presentation-quality streaming and recording.

Flex 3 Lens Changing Video

Interchangeable M12 lenses

The Flex 3 can be optimized for a variety of applications with custom-designed, interchangeable M12 lenses. Choose between 3.5mm, 4.5mm, and 5.5mm EFL lenses to adapt your cameras to your ideal capture volume. All three lenses feature a special spring focus assist, very low distortion, and fast F#1.6 apertures for increased tracking distance. Typical applications utilize 3.5mm for capture volumes in smaller spaces, 4.5mm for larger capture volumes and camera counts, and 5.5mm for facial capture.

Hand holding a Flex 3

Compact design for low profile integration

Flex 3 cameras can be discreetly integrated into large installations, or allow you to spatially optimize desktop capture volumes for face mocap and tracking rigid bodies. Choose red camera cases for higher visibility, or black for subtlety.


Unobtrusive infrared light

Flex 3 cameras emit 850nm IR light, which is nearly invisible, for inconspicuous and gentle lighting, thereby avoiding vision fatigue and unwanted attention to your capture rig caused by cameras that emit bright, visible spectrum light.

Flex 3 high power strobe

High power strobe mode

When used with an OptiHub, OptiTracks's custom high speed USB hub, Flex 3 cameras can operate in high power mode to draw additional power for the IR strobe. The extra power increases capture range and reduces marker dropout. The Flex 3's standard power mode is USB power compliant for use with off the shelf hubs and direct connections to a PC.

OptiHub external sync ports for Flex 3 cameras
OptiHub Guided Tour

Improve power regulation, camera syncing, tracking distance, and more.


OptiSync1 is OptiTrack's custom synchronization system, which sends and receives sync signals over USB cable. As a result, cabling is reduced by 50%, which enables faster and simpler setup.

External sync in/out

Integrate Flex 3 cameras into large scale tracking and analytical ecosystems with external sync in and out. Utilize frame triggers or free-run triggering to synchronize frame cycling with external software controls and hardware components like force plates and shutter glasses.

Flex 3 and FLEX:V100

V100 and V100:R2 compatibility

The Flex 3 includes backwards compatibility with existing V100 camera installations in traditional Wired Sync mode and V100:R2 installations in OptiSync or Wired Sync mode. OptiSync is only available for Flex 3 cameras connected to OptiHubs.

Start small and grow over time

OptiTrack systems are modular, reducing your initial investment in motion tracking technology. Start with a 6 camera bundle for under $7k, and as your tracking needs or budget expands, add more cameras or new software applications to increase the capabilities of your system.

OEM integration

OEM integration

Incorporate Flex 3 cameras into OEM tracking or computer vision applications via the free Camera SDK.

Close TableClose Table Prime 41Prime 41Large Volume Mocap Prime 17WPrime 17WMed-Large Volume, High Speed Prime 13Prime 13Medium Volume, High Speed Prime 13WPrime 13WWide FOV, High Speed Slim 13ESlim 13ELow Profile & OEM Flex 13Flex 13Medium Volume Mocap Flex 3Flex 3Small Volume Mocap Slim 3USlim 3UComputer Vision & OEM V120:TrioV120:Trio6DoF Desktop Tracking V120:DuoV120:Duo6DoF Desktop Tracking
Price $5,999 $3,499 $1,999 $2,499 $1,499 $999 $599 $279 $2,999 $2,299
Resolution 2048 × 2048 1664 × 1088 1280 × 1024 640 × 480 640 × 480 (×3) 640 × 480 (×2)
Frame Rate 180 FPS 360 FPS 240 FPS 120 FPS 100 FPS 120 FPS
Latency 5.5 ms 2.8 ms 4.2 ms 8.3 ms 10 ms 8.3 ms
Filter Switcher1 No No Included Optional Included2 No
Bundled Software n/a Motive:Tracker
(Perpetual License)
Finger Tracking Yes No Yes No
Single-device Multi-camera Tracking No Yes
Maximum Units Per Workstation 96+ 24 1
Maximum Range3
Using 5/8 inch markers
100 feet4
30.5 meters
50 feet
15.2 meters
40 feet
12.2 meters
20 feet
6.1 meters
40 feet
12.2 meters
40 feet5
12.2 meters
36 feet5
11 meters
Stock Lens
Horizontal FOV
51° 70° 56° 82° 56° 56° 46° n/a 47° 6 47° 6
Stock Lens
Vertical FOV
51° 49° 46° 70° 46° 46° 35° n/a 43° 43°
Optional Lenses
Horizontal FOV
n/a n/a 42° n/a 42° 42° 38°, 58° 38°, 46°, 58°, Other7 n/a n/a
Optional Lenses
Vertical FOV
n/a n/a 34° n/a 34° 34° 29°, 45° 29°, 35°, 45°, Other7 n/a n/a
Interface GigE/PoE+ GigE/PoE USB 2.0
Synchronization Method Network OptiSync Wired and OptiSync Wired8 n/a9 n/a9
Image Processing Modes Raw Grayscale, Segment, Object, and MJPEG10, 11, 12 Precision Grayscale, Raw Grayscale, Segment, Object, and MJPEG Precision Grayscale, Segment, and MJPEG
Number of LEDs 170 20 (UHP)13 62 10 (UHP)13 n/a 28 26 n/a 26 (×3) 26 (×2)
LED Strobe Mode Yes n/a Yes n/a Yes
LED Intensity Control Yes n/a Yes n/a Yes
Shutter Type Global
Electronic Exposure Control Yes
Frame Rate Control Yes
Camera Body Aluminum & Polycarbonate Aluminum Aluminum14 Aluminum
Standard Tripod Mount
-20 Thread
Yes Yes14 Yes
  1. Allows cameras to switch between infrared and visible light for scene video.
  2. Center imager only.
  3. Distance at which a marker is visible as a single pixel.
  4. Using Maximum Power for IR strobe, which requires a PoE+ Ethernet switch.
  5. Using High Power strobe mode, which requires an OptiHub.
  6. Horizontal FOV is based on the overlapping of cameras.
  7. Also accepts third-party CS/C/M12 lenses.
  8. Requires using the optional V120 Sync Break-Out Cable.
  9. Hardware sync between multiple V120:Duo and V120:Trio devices is not supported.
  10. Prime 41 MJPEG is downsampled to 1/16 resolution (512 × 512).
  11. Prime 17W MJPEG is downsampled to 1/4 resolution (832 × 544), frame rate is adjustable from 30 FPS to 350 FPS.
  12. Prime 13 and Prime 13W MJPEG is downsampled to 1/4 resolution (640 × 512)
  13. Ultra high power LEDs (UHP).
  14. With purchase of optional V120:SLIM case.
  1. Only enabled with the OptiHub, Optitrack's custom USB High Speed hub, designed to complement the Flex 3 camera.