ARRI WRC-1 - Manual (Page 56)

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With most lenses, the T-stops before the end-stops
are not exact due to the tolerances involved. In
order to avoid incorrect exposure, the adjusted
iris range should not contain these values.
With the iris wide open a lens-related reduction
in brightness towards the edge of the image
may occur, looking like an incorrect exposure.
The exact values are dependent on the lens type
and must be determined with test shots.
• Press the MODE button in the main menu to enter the
first submenu. The left and right end-stop of the handwheel
(minimum and maximum aperture) can be defined.
The first display line shows the value for the left end-stop,
the second line shows the value for the right end-stop.
• Press the SEL button for longer than 2 seconds.
The T-stop value in the first display line flashes.
The required value can now be adjusted using the
handwheel. Press the SEL button again to switch to the
next digit. The first digits are confirmed, and the decimal
is set to ‘0’ by pressing the SET button. The values in
the second display line can be set accordingly.
If the compensation range available with the
shutter angle is exceeded, the warning ‘ANGLE
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 Iris