ARRI WRC-2 Ramp Control Menu Exposure Compensation, Compensation via the Mirror Shutter

Ramp Control Menu

14.3 Exposure Compensation

Via the Ramp Menu three different exposure compensation methods can be selected:

1.) Compensation via the Mirror Shutter

The camera has to be outfitted with an electronic adjustable mirror shutter.

●Check the compensation box of the shutter ramp display. The shutter values will be computed by the WRC-2. (e.g. 11,25 to 180 degrees)

2.) Compensation via the iris

A CLM-1 or CLM-2 motor needs to be mounted to the camera and an iris table must be activated. Refer to chapter 15.

●Check the „Iris“ box of the iris ramp display. The iris values will be computed by the WRC–2

3.) Mixed Compensation via Shutter and Iris

●Check both the „Iris“ box and the „Shutter“ box of the ramp display. Use the Compensation Mix Slider to adjust the ratio between iris and shutter in 5% steps. To adjust the values in 1% steps, use the Arrow Buttons on the WRC-2.

Ramp Control Menu

Red values:

The ramp calculation can result in values that can not be accepted by the currently used camera or lens, e.g. T-stop 32, or 10degree shutter angle.

In this case the value will be displayed in red. Change the basic values, e.g. the speed, to keep the calculated values in an acceptable range.

Example:

A speed change from 1 to 128 fps with shutter compensation only is not possible since for compensation seven T-stops are necessary (1-2-4- 8-16-32-64-128fps), but the shutter can only provide four stops (180° -90°-45°-22,5°-11,25°). To solve the problem, either reduce the speed range or enable the iris compensation additionally.

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