Syncing the Settings of Two Cameras 115
First, the cameras have to be connected with an EXT cable (type: KC 155-
S). After this, the sensor sync mode has to be activated. This is done in
MENU>SYSTEM>EXT SYNC>Sensor sync. One camera has to be set as
EXT master, and the other camera as EXT slave.
The master triggers the slave camera so that images are created at the
same moment of time with an accuracy of 10s. After connecting both
cameras and activating the correct sensor sync modes, this takes about five
seconds. If any error occurs, the camera issues a warning.
Image integration between master and slave camera has a locked offset of
less than 10s. This means that in the worst case, exposure differs by 4.3%
(@ 60fps frame rate and 5.0° shutter angle). With a regular exposure time
(24fps, 172.8°), the maximum difference is 0.05%.
Synchronizing Image Output
The output of images both on the REC OUT and the MON OUT can be
synchronized, too. To achieve this, the user must send a trigger from the
master camera to the slave camera after sensor sync is established.
This is done by selecting "Send HD sync trigger" in the EXT SYNC menu
screen. When pressing the jogwheel, the trigger is sent. The slave camera
will then no longer display the warning "HD outs not synced. Trigger now!".
If the two camera's settings are synced over Ethernet, the trigger is
automatically sent.
When the outputs are synced, jitter between the two camera's HD outputs is
less than 500ns. The HD output of a camera can be pre- or delayed by 30
HD clocks (1 HD clock= 13.46ns), allowing for a total shift of 60 HD clocks
(808ns total) between cameras, if desired.
Timecode
Timecode is also transmitted from the master to the slave via the EXT cable.
When a camera has been set to slave, it automatically uses the TC values
transmitted via the EXT cable. The TC screen will show "EXT TC from
master camera" as TC source, and all options are disabled.
12.5 Syncing the Settings of Two Cameras
It is possible to operate two ALEXAs with synchronized settings.
Camera connection
Connect two ALEXAs with the ALEXA Ethernet/Ethernet Cable KC 156-S, or
with the ALEXA Ethernet/RJ-45 Cable KC 153-S over an Ethernet hub.
Camera setup
Go to MENU>SYSTEM>EXT SYNC, and set "Settings sync" to "ETH
master" on one camera. Set the other camera to "ETH slave".
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