Defining end-stops / limit values, Programming, Tolerances – ARRI WRC-1 User Manual

Page 53: Vignetting, Iris / compensation shutter angle, Controlling the iris

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53

selected speed cannot be attained with this
camera). Correct parameters must be set before
the camera is started!

Note:

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.

By pressing the SET button the currently set shutter angle
(if controlled by the WRC-1) can be shown in the first
display line. The currently set camera speed is shown in
the second display line.

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 for the hand-
wheel (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.

• Press the MODE button to go to the next submenu.

To define the fixed values for the mirror shutter angle
(if controlled by the WRC-1), and the camera speed,
use the SEL and SET buttons and the handwheel, as
described above.

Controlling the Iris

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