ARRI ALEXA - Syncing the Sensors of Two Cameras

114 Operation of The Camera
 Variations: If the shooting starts close to midnight, the TC might be
started with an offset to prevent a rollover at midnight.
 Restrictions: Only possible if the camera is running at sync-sound
speed. If the camera is over- or under-cranking, the TC frame rate will
no longer match the sensor frame rate, so that TC values would either
be duplicate or dropped. Due to this reason, the camera will
automatically switch to Int TC Regen, when the sensor frame rate is
changed.
Internal TC, Rec Run
 Use: Single camera productions, either MOS or where a classical
slate is used for alignment of image and sound. Guarantees
continuous time code for each storage medium. Works alos with over-
and under-cranking.
 Setup: The camera is set to Int TC Rec Run Regen. TC is only
increased during record by 1 frame for each image generated by the
sensor. The TC counts with the project fps set on the camera as time
base. Normally, the TC hour value is increased by 1 hour for each
new reel, usiong only hours 01-20 for reel 1-20, and then restarting at
hour 01 for reel 21.
 Variations: Might be used on a production normally using external TC
for high-speed scenes, then returning to Ext TC for regular scenes
later.
 Restrictions: None.
12.4 Syncing the Sensors of Two Cameras
For 3D applications or shoots where it is necessary to synchronize the
sensors of two cameras so that images are exposed at the exact same time,
it its possible to sync two ALEXAs through their EXT connectors via cable.
Note: Syncing two sensors is possible in an fps range from 1.000 to 60.000 fps