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2011Cameras (Film/Video/HD) forum

Mounting and balancing the Codex Onboard recorder with Alexa cameras on steadicam rigs

15 years old. Gear and prices may have changed since.

What the thread found

  • The Codex Onboard recorder weighs 5.7 pounds and can be mounted on the rear of an Alexa camera body without requiring modification to the camera itself.
  • Multiple mounting configurations are possible: rear of camera, bottom of sled using an Anton Bauer plate, or mounted to external support structures, each affecting gimbal balance and operating characteristics differently.
  • The Codex can be powered via a D-tap connection from a monitor-mounted battery and triggered to start and stop through a standard three-pin accessory cable connected to the Alexa, receiving run commands through video cables from the recorder output.
  • Mounting the Codex on the rear of the camera provides better balance and allows use of low-mode plates compared to mounting it on top.
  • An Anton Bauer gold mount plate can be modified to match the four mounting points on the Codex, providing a secure connection, though weight distribution and gimbal-to-camera distance significantly impact steadicam operating difficulty.
  • Codex power consumption can cause battery voltage to drop unexpectedly during extended takes, requiring operator discipline to swap batteries preemptively before they reach critical levels.
  • Battery runtime depends on multiple power draws from the system and weather conditions, with reported usable duration exceeding 30 minutes in cold conditions when cameras, monitors, transmitters, and focus systems are powered simultaneously.

Depends on

  • The discussion centers on 2011 equipment and specific configurations for film production in cold, wet conditions in Germany.
  • Mounting approaches varied based on individual operator preferences and specific rig geometry, suggesting no single optimal solution.
  • One instance of Codex shutdown due to voltage drop was mentioned but may not represent typical operation.
  • The Transvideo transmitter mentioned had range limitations (could not reliably transmit beyond 50 meters in certain conditions) that may not apply to other transmitter options.
  • Weight distribution concerns were described as presenting a learning curve for operators accustomed to film cameras with different mass characteristics.

Parts

Low Mode

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