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Camera Controls 75
Audio out
level
Set the level of the audio out channels manually, or set it to fix
the maximum output.
NOTICE
•
These settings do not influence the audio signal embedded in the HD-SDI
connectors or recorded in QuickTime clips. They only affect the AUDIO OUT
connector.
•
ALEXA automatically determines the internal signal run time and matches audio
and images so they are always in sync. When changing sensor fps or project
fps, it may take up to 2 seconds for the camera to resync image and audio
signals.
13.1.3.4 SHUTTER
Press the SHUTTER button in the HOME screen to open the SHUTTER ANGLE
screen.
NOTICE
Access to this screen is disabled during record.
The list of default shutter angles includes 11.2°, 22.5°, 45.0°, 90.0°, 172.8°, 180.0°,
270.0° and 358.0°. User-defined shutter angles can be set by pressing the ADD
button. The exposure time for the current frame rate and shutter angle is indicated in
seconds at the bottom of the SHUTTER ANGLE screen.
The shutter angle range is 5.0° to 358.0° up to 60 fps and 5.0° to 356.0° above 60 fps.
Below the list, the actual exposure time at the currently set frame rate is shown.
NOTICE
Be aware that the combination of long exposure times (a low sensor frame rate and
large shutter angle) and high exposure indexes can lead to image artifacts! Try to
avoid exposure times longer than 1/25th of a second for maximum image quality.
Fig. 27: Shutter list
13.1.3.5 EI
The Exposure Index (EI) is the applied sensitivity of the camera.
The ALEXA has a base sensitivity of 800 ASA. This means that the dynamic range is
almost evenly distributed above and below neutral gray with low noise in the shadows
and clean, smooth clipping behavior in the highlights.
Due to its high dynamic range, the ALEXA’s sensitivity can be set from 160 to 3200
ASA in steps of 1/3 stops while maintaining high image quality.
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