Marell electronic bubble leveling device for steadicam rigs with gravity and acceleration sensors

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2004Monitors forum

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

The Marell electronic bubble incorporates multiple gravity sensors and a processor to calculate and compensate for rotational spin, centrifugal force, and acceleration effects.
The device costs between 650 and 950 British pounds depending on included features, with a base package including bubble display, frame line generator, and crosshairs at 950 pounds.
The bubble display is fully customizable with adjustable positioning, line placement, shading options, and sensitivity/damping settings through software.
The unit provides multiple video outputs including clean feeds and bubble-overlaid feeds via a built-in video distribution amplifier.
A battery voltage indicator displays the 12-volt system power level, helping operators detect power depletion before rigs fail during operation.
Mounting the bubble closer to the center of rotation theoretically reduces susceptibility to centrifugal force errors during rapid panning movements.
The device can be oriented and mounted in any direction, with users reporting successful mounting directly underneath the post on MK-V Evolution sleds using velcro.
Acceleration compensation involves multiple sensors working together, though the technology cannot completely eliminate all measurement errors due to fundamental physics limitations.
The Marell bubble includes video feed distribution capabilities with options for both clean outputs and outputs with bubble overlay simultaneously.

Some residual leveling error is unavoidable according to physics principles and cannot be completely eliminated.
Mounting position closer to the rotation axis may provide theoretical advantages, but practical differences in real-world operation remain unverified by experienced operators.
The device measures only the 12-volt power system on steadicam sleds, not the full electrical load.
No direct comparison testing with competing FBX bubble systems had been conducted at the time of discussion.
User reports are from early adoption phase and do not represent extensive field testing.