Frame rates higher than 37 fps in 4:3 or 48 fps in 16:9 reduce the
maximum possible mirror shutter angle. When the frame rate change
reduces the allowed mirror shutter angle below the currently active
shutter angle, the camera automatically sets the shutter angle to 135.0°.
The technically possible maximum shutter angle depends on the frame
rate.
To set the maximum available shutter angle:
1. Press the SHUTTER button on the HOME screen to get to the
SHUTTER ANGLE screen.
2. Press the ADD button on the SHUTTER ANGLE screen to get to the
SHUTTER ANGLE ADD screen.
3. Press the MAX button on the SHUTTER ANGLE ADD screen and
confirm by pressing the jogwheel twice.
The maximum available shutter angle is now a part of the shutter list
and can be set by pressing the jogwheel.
When the mirror shutter is on, the camera redirects the user to the
SHUTTER ANGLE screen after setting the sensor frame rate, where the
shutter angle can be adjusted as desired. To cancel this action, press
the HOME button.
15.4 4:3 Mode
In 4:3 mode, the camera captures images from a vertically extended
sensor area. The used area is 23.76 x 17.82mm in size, which translates
to 2880 x 2160 sensor photo sites.
Note: The sensors of standard ALEXA and ALEXA Plus cameras can only be
operated in 16:9 mode.
To change the sensor mode:
1. In the System menu, select Sensor.
2. Select Sensor mode. The current sensor mode is indicated on the
top line on the SENSOR screen.
3. Press the jogwheel to select 16:9 or 4:3 sensor mode.
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