User guide

User interface Main UI 55
Press the DELETE button to delete list entries. Entries must first be
selected with wheel. Deletion must be confirmed by pressing the two
lower screen buttons simultaneously.
Note: It is not possible to delete a list completely. When the last list entry is
reached, deletion is disabled.
Figure 36: Shutter list delete screen
12.1.4.4 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.
ALEXA has a basic sensitivity of 800 ASA. This means that the dynamic
range is evenly distributed above and below neutral grey with very low
noise in the blacks and a very screen clipping behaviour in the whites.
Due to its high dynamic range, the sensitivity can be set in a range from
160-1600 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 gets bigger, 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.