Sony FCB-EV7520 Technical Manual page 11

Spot Exposure Mode
In Full Auto AE, the level for the entire screen is
computed and the optimum Auto Iris and Gain levels
are determined. In Spot AE, a particular section of the
subject can be designated, and then that portion of the
image can be weighted and a value computed so that
Iris and Gain can be optimized to obtain an image.
For example, in an image with a lot of movement and
with varying levels of brightness, portions without
much change can be designated as such a "spot, " and
changes to the screen can be minimized in that area.
As shown in the diagram below, a range of 16 blocks
vertically and 16 blocks horizontally can be designated.
In the case where the center is designated (shown in
black), the level is computed along with a weighted
value for the surrounding block (shaded), including the
specified portions; and then the Gain and Iris are set.
The value of the designated portions and the
surrounding areas should be calculated as 100%, the
rest should be set to 20%. The range of the Spot AE
frame is fixed to 5 blocks vertically and 4 blocks
horizontally.
0 1 2 3 4 5 6 7 8 9 A B C D E F
0
1
2
3
Vertical 16
4
5
6
7
8
9
A
B
C
D
E
F
Exposure Compensation
Exposure compensation is a function which offsets the
internal reference brightness level used in the AE
mode, by steps of 1.5 dB.
Data Step Setting value
0E +7
0D +6
0C +5
0B +4
0A +3
09 +2
08 +1
07 0
06 −1
05 −2
04 −3
03 −4
02 −5
01 −6
00 −7
Horizontal 16
(8,7)
+10.5 dB
+9 dB
+7.5 dB
+6 dB
+4.5 dB
+3 dB
+1.5 dB
0 dB
−1.5 dB
−3 dB
−4.5 dB
−6 dB
−7.5 dB
−9 dB
−10.5 dB
Slow AE (Auto Exposure)
The slow AE Response function allows you to reduce
the exposure response speed. Usually the camera is set
up so that the optimum exposure can be obtained
automatically within about
1 second. However, using the slow AE response
function allows you to lengthen the auto exposure
response speed from the initial setup speed (01h) to
approx. 10 minutes (30h) (at normal shutter speed).
For example, with the normal setting (about 1 second),
if the headlights of a car are caught by the camera, the
camera automatically adjusts the exposure so that it can
shoot a high-intensity subject (in this case, the
headlights). As a result, images around the headlights,
that is, the rest of the subject, except the headlights,
becomes relatively dark, and poorly distinguished.
However, using the slow AE function means the AE
response speed will be slower, and response time will
be longer. As a result, even if the camera catches a high-
intensity subject (e.g., the headlights) for a moment,
you can still easily distinguish the portions of the image
surrounding the headlights.
High Resolution Mode
This mode enhances edges and produces higher
definition images.
Aperture Control
Aperture control is a function which adjusts the edge
enhancement of objects in the picture. There are 16
levels of adjustment, starting from "no enhancement. "
When shooting text, this control may help by making
them sharper.
Backlight Compensation
When the background of the subject is too bright, or
when the subject is too dark due to shooting in the AE
mode, back light compensation will make the subject
appear clearer.
Visibility Enhancer (VE)
Depending on the imaging scene, the Visibility
Enhancer function makes the darker part of a camera
image brighter, and automatically correct brightness
and contrast to show bright parts clearly.
11
Basic Functions