ARRI WRC-1 - Manual (Page 51)

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Note: If a previously programmed iris table is re-edited,
the corresponding table must first be loaded
from its memory area as described above.
The handwheel must then be turned in the table
menu (TBL LOAD, TBL DEL, TBL EDIT, TBL STORE)
until ‘EDIT’ is displayed in the second line.
Confirm with the SEL button to return to the edit
mode for this table.
5.5.1.5 Important instructions for programming
the iris of the lens
• If the lens has a CLOSE position, this must also be defined,
as the iris table only applies up to the last value before
the CLOSE position! When assigning, the CLOSE position
is programmed after the highest possible T-stop setting.
• If the T-stop scale of the lens being used is linear, it is
sufficient to enter just two T-stops, which must be at
least four T-stops apart, in order to define the iris
table. If the T-stop scale is not linear, all the T-stops
must be assigned individually.
• For compensating the exposure, only the range between
full T-stops may be used! Example: the iris scale of the
lens reaches from T2.2 to 22. The values for T4 and
T16 are assigned. The resulting usable range rechaes
from T2.8 to T22, as T2.2 is not a T-stop from the
standard T-stop range (this would be T2.0, for example).
• The display shows full T-stops followed by the tenth of
a T-stop. Example: T-stop 2.8 plus half a T-stop is
shown as 2.8_5. The tenths of a T-stop are linearly
divided between the two full T-stop positions.
• To check the image in the viewfinder, the iris can be
opened completely by pressing the OPEN button. The
iris remains open until the OPEN button is released
again. This does not alter the programmed settings.
The OPEN button is without function while the camera
is running.
Controlling the Iris