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2023From a Facebook group: Arri Artemis Trinity

Mounting Preston MDR4 focus motor and Light Ranger iris control on an ALEXA 35 on the ARRI Trinity

What the thread found

  • Position the MDR4 as far back as possible so it acts as a counterweight to the sensor and lens.
  • Compact motor mounts such as the Heden DM5, which have similar weight, assist in balancing the rig arrangement.
  • A lightweight matte box (Abracam model) is considered nearly essential for Trinity configurations.
  • Placing the video wireless transmitter at the rear of the sled foot (tail) rather than on the camera itself reduces load on the gimbal head.

Depends on

  • Configuration depends on specific lens weight and camera setup.
  • Motor mounting solutions vary with rig geometry and balance requirements.

Gear in this thread

ALEXA 35catalog, MDR

Same gear or parts

  1. 2026Eliminating vibration with the ARRI ALEXA 35 on Steadicam®: rigid mounting plate options to bypass the dovetail systemFacebookThe Steadicam Group
  2. 2026Mounting the RIA-1 wireless receiver on ARRI Trinity with ALEXA 35FacebookArri Artemis Trinity
  3. 2026Power distribution failure of D-Tap step-down splitters on a Venice 2 rig, and proper AKS accessory power supply methods.DisputedFacebookSteadicam operators group
  4. 2026Swapping an ARRI ALEXA 35 between tripod/studio and Steadicam® mounting: baseplate choice and fastest workflow.FacebookSteadicam operators group
Original thread on Facebook (group members only)Ask about this threadThe answer cites the archive