ARRI WRC-1 - Manual (Page 82)

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Press the SEL button for longer than 2 seconds.
Depending on the definable limit value, the T-stop value
flashes in the first or second display line.
This can now be set using the handwheel.
The automatically calculated other limit value is shown
in the other display line.
Press the SEL button again to switch to the decimal.
The selected T-stop is confirmed and the decimal set to
‘0’ by pressing the SET button.
The maximum aperture (smallest T-stop number)
corresponds to the selected minimum shutter angle
opening.
If the compensation range available for the iris
ring is exceeded (e.g. the start T-stop is at the
beginning or end of the adjustment range), the
READY LED flashes green and the warning ‘IRIS
RANGE’ flashes on the display after returning
to the main menu. The settings for the iris or the
shutter angle must be corrected accordingly!
The camera can still be started for test purposes
in spite of the flashing warning. However, the
exposure may be incorrect!
Controlling the Shutter Angle