ARRI WRC-1 - Manual (Page 46)

46
Note: 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.
After programming the iris table, all individual
T-stops on the lens must be checked by adjusting
with the handwheel in order to avoid incorrect
exposures!
Note: 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.
Note: 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 reaches from T2.8 to
T22, as T2.2 is not a T-stop from the standard
T-stop range (T2.0).
Note: If a T-stop value has been assigned which
cannot be correct, a warning is displayed; e.g.
T-stop 11 cannot lie between 5.6 and 8. The
incorrectly positioned value must be deleted.
If the iris table should remain available after using
another lens, it must be stored as described below. This
also applies when an iris table has been re-edited.
Controlling the Iris