User Manual

Operators Guide
10
Introduction
The 120EX pan and tilt head embodies a unique and patented EX-counterbalance mechanism
for true and accurate balance, EX-drag assemblies for ultra-smooth pan and tilt motions and an
adjustable camera mounting plate.
Extended capacity balance
The spring counterbalancing mechanism comprises four springs operating against a three-
dimensional cam connected to the camera mounting platform. The balance mechanism is
adjusted by the counterbalance crank on the lower left rear of the head. The knob has a
retractable handle and the 'push in and turn' action uses a clutch to prevent inadvertent damage
to the balance mechanism. Adjustments should only be made with the platform in the horizontal
position.
Maximum and minimum payloads that can be balanced, and tilt ranges, are dependent on the
weight of the camera and accessories and on the center of gravity (C of G) height. The graph
below shows the range of loads and C of G heights that can be maintained in balance. At the
lower end of the weight range the full ±90 degree tilt range is available while at the maximum
load the tilt range is reduced to ±60 degrees.
Digital display
The digital display indicates the setting of the balance mechanism on a scale of 0-182%. Press
the display actuator button to illuminate the display and adjust the counterbalance crank. At
settings above 100% the EX indicator will turn on to alert you to the reduced tilt range. The
display turns off automatically approximately 15 seconds after you stop adjusting. The display
dims in dark surroundings.
Figure 3 120EX Pan & Tilt Head - balance graph