ARRI ARRIFLEX 235 - Manual (Page 39)

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Filming with HMI Light
When lighting scenes with HMI/CID-discharge lamps, the
pulsing light intensity is dependent on the supply frequency.
To achieve constant exposure, the camera’s frame rate,
the supply frequency of the lighting and the angle of the
mirror shutter must all relate to each other. As the camera
frame rate and the supply frequency of the lighting are
normally given, compensation must be carried out
through the angle of the mirror shutter.
The following table indicates the mirror shutter angle that
needs to be set:
Supply frequency
50 Hz 60 Hz
Frame rate 25 fps 24 fps 24 fps
Shutter angle
180° 172.8° 144°
Camera Body