60 Camera Controls
Figure 39: Shutter list
The shutter angle can be set in a range from 5.0° to 358.0°.
11.1.3.5 EI
The Exposure Index is the applied sensitivity of the camera.
Note: The Exposure Index list has a fixed content, meaning that it cannot be changed
by the user.
Figure 40: Exposure Index screen
ALEXA has a basic sensitivity of 800 ASA. This means that the dynamic
range is almost evenly distributed above and below neutral grey with very
low noise in the dark parts of the image and a very clean and smooth
clipping behavior in the bright parts.
Due to its high dynamic range, the sensitivity can be set in a range from 160-
3200 ASA in steps of 1/3 stops while keeping a high image quality.
Applying the extreme ASA ratings will nonetheless have an influence on the
images. At low ASA ratings like 160 ASA, the dynamic range below neutral
grey increases, which will reduce noise even further. At the same time, the
dynamic range above neutral grey is slightly reduced. The clipping itself is
not influenced by this, but the shoulder of the gamma curve will get slightly
steeper, which will reduce the smoothness of the clipping.
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