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76 Camera Controls
Fig. 28: Exposure Index screen
NOTICE
•
The Exposure Index list has fixed content, meaning that it cannot be changed
by the user.
•
When changing the EI setting during recording, one or more frames on the
recorded material may show artifacts resulting from the change.
•
An area that is overexposed more than eight stops above clipping can appear
darker than its surroundings.
Applying the exposure indexes at the extremes of the range will nonetheless have
an influence on the images. At low exposure indexes, such as 160 ASA, the dynamic
range below neutral gray increases, reducing noise even further. At the same time,
the dynamic range above neutral gray is slightly reduced. Highlight clipping itself is
not influenced by this, but the shoulder of the gamma curve will get slightly steeper,
reducing the smoothness of the change from almost overexposed to overexposed.
At high exposure indexes, such as 1600 ASA, the images behave in the opposite way.
Noise is increased, which makes it important to judge shadow detail, while there will
be even more headroom in the highlights.
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