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3-2 Iris Operation
Normally, lens iris operation is performed by the position
servo control method using commands from the camera
CCU. Control can be switched between auto iris control and
remote iris control.
The camera operator can also perform remote iris
control using a switch box (special version) as a special
specification.
Control from the Camera
Both automatic and remote iris control are usually operated
from the CCU. (Refer to the camera operation manual on
how to operate.)
During the shooting, an approximate F number (iris value)
can be checked with the indicator panel on the left side of
the lens, as viewed from the camera.
The value indicated by the indicator varies
depending on the model.
Setting the iris control select switch
(Excluding UJ122x8.2B AF)
The DIP switch (SW2) No. 4 was set to the "OFF" position
(I.CAMERA) at the factory prior to shipment so that the iris
can be operated from the camera. If the iris operation is
disabled, follow the steps below to check the setting position
of DIP switch (SW2) No. 4.
"OFF" position: Iris operation is enabled from the camera.
"ON" position: Iris operation is enabled from such as switch
box.
1
Remove the lens shroud.
2
Check that DIP switch is set to the "OFF" position. If
the switch is set to "ON" position, change the setting to
the "OFF" position.
F Number Indicator
Control from the Switch Box
When a switch box which is capable to control the iris
function of the lens is mounted, the iris function of the lens is
controlled by it.
NOTE
Changing settings for models that support Remote Back Focus
require a service technician and cannot be performed with the
following method. Please contact your dealer or Canon.
Setting the iris control select switch
Settings must be performed at the lens side in order for the
iris to be controlled from the switch box. Follow the setting
steps below.
1
Remove the lens shroud.
2
Change the DIP switch setting to the "ON" position
(I.LOCAL).
Controlling
Control the iris by turning the iris control knob as set forth
below.
Turning the knob clockwise:
The iris moves in the opening direction.
Turning the knob counterclockwise:
The iris moves in the closing direction.
As when the iris is to be controlled from the camera, the
approximate F number can be monitored on the indicator
panel.
NOTE
• See the section "Mounting the Switch Box" (p. E4) for details of
how to mount and connect the switch box.
• Refer to the table "Iris mode" in the section 2-5 "Iris Mode Setting"
to understand the relationship among the command signals from
camera, iris control device, and the position of the iris control
select switch.
E15
3 OPERATION
Iris Control Knob
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