148 ALEXA Studio
Frame rates higher than 37 fps in 4:3 or 46 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 achieve the
maximum possible shutter angle:
Press the SHUTTER button in the Homescreen to get to the Shutter
list screen.
Press the ADD button in the Shutter list screen to get to the Shutter
angle screen.
Press the MAX button in the Shutter Angle screen and confirm by
pressing the jogwheel twice.
The maximum possible 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
list screen after setting the sensor frame rate, where the shutter angle can
be adjusted as desired. To cancel this action, press the HOME button.
14.5 4:3 mode
Note: 4:3 mode is currently only available as a separate software packet, SUP 5.2
BETA.
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 pixels.
Frame rate
The maximum sensor frame rate in 4:3 is 48 fps.
Recording
Recording is currently only possible to external ARRIRAW recorders that
support ARRIRAW 4:3. The REC OUT is limited to ARRIRAW T-Link formats
in 4:3 mode.
Internal recording will be enabled in a future SUP.
Monitoring
For monitoring, the 4:3 image is downscaled to 958 x 720 pixels for the EVF
and 1440 x 1080 for the MON OUT. Only horizontal surround view is
available in 4:3 mode. The image is not rescaled for surround view, but
horizontally extended. The non-active area of the EVF and MON OUT is
filled with black ("pillarboxed").
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