Shutter - ARRI ALEXA Series User Manual

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11.1.3.4 SHUTTER

11.1.3.5 EI
SHUTTER
Press the button in the HOME screen to open the SHUTTER
ANGLE screen.
Note: 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
ADD
by pressing the
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°. In High Speed mode, the
shutter angle is limited to a maximum of 356.0°.
Below the list, the actual exposure time at the currently set frame rate is
shown.
Note: 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.
Figure 50: Shutter list
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.
button. The exposure time for the current frame
Camera Controls