ARRI WRC-1 - Manual (Page 77)

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5.6 Controlling the mirror shutter angle
For cameras without an electronically adjustable mirror
shutter, the warning ‘NO ANGLE’ is displayed in the
main menu when selecting a function for the shutter angle.
The READY LED flashes green.
If the iris of the lens is not controlled by the WRC-1, the
warning ‘NO IRIS’ appears in the main menu when
selecting a WRC function or compensation which requires
the iris ring to be controlled.
Controlling the Shutter Angle