Blackmagicdesign ATEM Live Installation And Operation Manual page 180

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Camera Number
Each CCU has its own large camera number that shows you which camera is being controlled.
This large display is illuminated green when in a neutral state and red when its camera is
switched to the program output.
Gain and Pedestal Level Control
The joystick control lets you make fine adjustments to the gain/iris and pedestal/master
black levels.
Leaning the joystick forwards or backwards opens or closes the camera's iris, also known as
the gain level. As you lean the joystick forwards and backwards, its indicator strip will illuminate,
providing an approximate display of the camera's exposure. For a precise assessment of the
exposure f-stop, observe the iris indicator.
Located around the collar of the joystick's handle is a ring wheel that controls the pedestal
level. The ring wheel has small ridges built in for firm control and a position indicator is located
on the top of the knob to show the physical positioning of the wheel. Turn the wheel clockwise
to increase the master black level, or counter clockwise to decrease.
The joystick lets you adjust the gain level by leaning the controller
forwards and backwards. The master black level can be adjusted
by turning the ring wheel clockwise or counter clockwise.
Corresponding indicators are provided for accurate measurement.
Using ATEM Camera Control Panel 180