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ARRI ALEXA - Page 147

ARRI ALEXA
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Studio Camera Controls 147
Note: For frame rates higher than 30 fps, it is recommended to use a power source
with a voltage level of 18-35 V to ensure the mirror shutter is powered sufficiently!
MIRROR PARK buttons VIEW and GATE
The camera left side Operator Controls have two additional function buttons
labelled VIEW and GATE. These buttons control the parking position of the
mirror shutter.
A spinning mirror shutter can be stopped by pressing either of the two
buttons. Pressing the VIEW button will park the mirror in the optical path,
enabling a live preview in the optical viewfinder.
Pressing the GATE button will stop the mirror shutter out of the optical path,
enabling a live preview on the EVF (if mounted), the MON OUT and the REC
OUT. Each button is accompanied by a blue LED that lights when the mirror
is parked in the respective position. When the mirror shutter is running, both
of the LEDs will be active.
Pressing the GATE button while the mirror is parked in the VIEW position will
move the mirror shutter by 180.0° degrees into the GATE position.
Pressing the VIEW button while the mirror is parked in the GATE position will
move the mirror shutter by 180.0° degrees into the VIEW position.
To restart the mirror shutter, press the button of the position the mirror is
parked in.
Note: After booting the camera, the mirror shutter is parked in the GATE
position for safety reasons.
When stopping, the mirror shutter always open up the electronic sector gate
to 180.0°, and closes down when it is restarted.
A live image on EVF, MON OUT and REC OUT is available when the mirror
shutter is spinning or parked in the GATE position. A parked mirror shutter
will automatically start spinning when recording is started.
When the mirror shutter is switched off, it is still possible to move the mirror
shutter between the GATE and VIEW positions, but it is not possible to spin
the shutter.
Note: For safety reasons, it is required to power down the camera before performing
a "gate check". Do not check or clean the sensor cover glass while the camera is
powerded up and the mirror is parked in the GATE position!
Frame rate and shutter angle with mirror shutter on
When the mirror shutter is switched on, the sensor frame rate is limited to 60
fps in 16:9 and 48 fps in 4:3 (Note: 4:3 is only supported in SUP 5.2 BETA).

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