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ALEXA SXT Studio 159
17.2 Optics
17.2.1 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 that 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 captured 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.
17.2.2 Lens Adapter PL Mount LA-PL-2
For a general description, please refer to page 47.
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