Flex 13 from $999

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Flex 13 - Mocap/tracking camera

Introducing the Flex 13, offering the cleanest data that $1K can buy.

With an impressive 1.3 million pixels of resolution, 120 FPS sample rate, and an immense 56° field of view, the Flex 13 is an achievement in efficient, affordable motion capture. Enjoy the precision and accuracy of a professional capture system at a price tuned for AAA and indie studios alike.

Flex 13 Guided Tour
Watch the Guided Tour

Take a journey deep into the Flex 13 as we highlight features along the way.

Watch the Flex 13 Resolution Test

The cleanest data that $1k can buy

The Flex 13’s 1.3 MP imager offers over 4x the resolution of a Flex 3. When combined with OptiTrack’s proprietary real-time processing algorithms, it can track motions within a tolerance of less than 0.5 mm—ideal for rigorous tracking applications, such as multi-actor capture and complex motion tracking.

Maximize your capture volume

You asked for more capture volume, and we were listening. When deployed with the default 56° lens in a standard 20’ × 20’ arrangement, the camera can attain an active capture area that is among the largest in the industry, which allows for extensive capture volumes even in modest tracking environments.

Flex 13 capture volume
Grayscale imaging mode Object imaging mode

Precision Grayscale | Object

Precision Grayscale

Precision Grayscale (orange) vs. Segment (green)

On-camera image processing

The Flex 13 can send a variety of pre-processed image types to the PC, resulting in more efficient imaging and system scaling. Image processing types include:

  • Object - Performs on-camera detection of marker location, size, and roundness using our most precise grayscale processing methods. Provides excellent precision with the smallest CPU footprint.
  • Precision grayscale - Similar to Object processing, but sends selective grayscale images of markers to the PC for calculation of object data. Provides the most verbose marker information, but requires more CPU resources than Object processing.
  • Segment - Like precision grayscale processing, segment mode divides processing between the camera and CPU, providing streamlined marker information for CPU-efficient marker detection. Provides a balance between precision and processing load.
  • MJPEG-compressed grayscale - Full resolution grayscale frames, compressed on-camera for highly scalable scene video capabilities.
  • Raw grayscale - Full resolution, uncompressed grayscale.

MJPEG compression

Unique to OptiTrack cameras, on-camera MJPEG compression consumes 1/10th the bandwidth of uncompressed video while still enabling real-time grayscale video at full resolution and full frame rate (up to 1280 × 1024 @ 120 FPS). 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 MJPEG grayscale video at up to 120 FPS and transform any Flex 13 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 13 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 real-time feedback for performance analysis.

3D overlay

Record MJPEG grayscale footage at up to 120 frames per second—5x 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.

On-camera Aim Assist button

Aim Assist - single user camera setup & aiming

One person can efficiently setup and aim a complete Flex 13 system with OptiTrack's on-camera Aim Assist. One button press brings the camera view to full screen, sets the image to grayscale, retracts the IR filter and increases the exposure for additional lighting and better image clarity. The image is perfect so that placing reference markers on the capture volume floor is no longer necessary. Aim each camera conveniently and precisely without even needing to touch the software interface. Once a camera has been aimed, move on to the next with a single button push.

Watch the Filter Switcher Guided Tour

Flexible filtering options

Customize your Flex 13’s lens filter for standard IR motion capture or visible-spectrum reference video, for light filtering that is perfectly suited to your capture environment and application. Include the Filter Switcher add-on for quickly swapping between both filtering options.

Flex 13 Lens Changing Video

Interchangeable M12 lenses

The Flex 13 can be optimized for a variety of applications with custom-designed, interchangeable M12 lenses. Choose between 5.5mm and 8mm EFL lenses to adapt your cameras to your ideal capture volume. Both feature a special spring focus assist, very low distortion, and fast F#1.8 apertures for increased tracking distance. Typical applications utilize 5.5mm lenses for standard tracking applications and 8mm lenses when additional range or pixel density is required.


Unobtrusive infrared light

Flex 13 cameras emit 850nm IR light, which is nearly invisible, for inconspicuous illumination that prevents the vision fatigue and unwanted attention to your capture rig caused by cameras that emit visible spectrum light.

OptiHub external sync ports for Flex 13 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 13 cameras into scientific and studio ecosystems with external sync in and out1, enabled with the OptiHub 2. Utilize frame triggers or free-run triggering to synchronize frame cycling with external software controls and hardware components like force plates and shutter glasses.

If you require Genlock and SMPTE capabilities, please see the Prime Series camera and eSync 2.

OEM integration

OEM integration

Incorporate Flex 13 cameras into custom vision or tracking 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 2, Optitrack's custom USB High Speed hub, designed to complement Flex cameras.