136 ALEXA Studio
14.3 Optics
14.3.1 Electronic mirror shutter
The electronic mirror shutter is located between the PL-mount and the image
sensor at an angle of about 45°. It is part of the optical reflex viewfinder
system in that it reflects the lens image into the optical viewfinder.
It is synchronized with the electronic shutter of the camera sensor so that the
sensor is only read out in the dark phase. This completely removes rolling
shutter effects of the sensor readout.
Its 180° mirrored surface reflects the lens image into the optical viewfinder.
The open sector of the mirror shutter can be reduced through an
electronically controlled sector gate. The mirror shutter rotates 360° for every
capured frame, controlling the exposure of the sensor through its open
sector. The readout of the sensor happens while the mirror reflects the light
of the optical path into the optical viewfinder.
The angle of the open sector is electronically controlled via the regular
camera controls.
14.3.2 Lens mount LA-PL-2 (with LDS)
The lens mount of the ALEXA Studio supports the ARRI Lens Data System.
The LDS lens must be mounted in the 12 o'clock or 3 o'clock position to
enable the LDS functions. Take great care not to harm any elements of the
LDS contacts on either lens or camera when attaching or deattaching a lens
or lens port cover.
Besides the LDS feature, the same rules as with the LA-PL-1 apply.
Figure 99: ALEXA Studio PL-Mount
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