Sony FCB-ER8550 Technical Manual page 9

AE – Iris Priority
The iris can be set freely by the user in 22 steps
between F2 and Close.
The gain and shutter speed are set automatically
according to the brightness of the subject.
Data Setting value
19 F2
18 F2.2
17 F2.4
16 F2.6
15 F2.8
14 F3.1
13 F3.4
12 F3.7
11 F4
10 F4.4
0F F4.8
AE – Manual
The shutter speed (28 steps), iris (22 steps) and gain
(17 steps) can be set freely by the user.
AE – Bright
The bright control function adjusts both gain and iris
using an internal algorithm, according to a brightness
level freely set by the user. Exposure is controlled by
gain when dark, and by iris when bright.
As both gain and iris are fixed, this mode is used when
exposing at a fixed camera sensitivity. When switching
from Full Auto or Shutter Priority Mode to Bright
Mode, the current status will be retained for a short
period of time.
Only when the AE mode is set to "Full Auto" or
"Shutter Priority, " can you switch it to "Bright. "
Gain
Iris AGC
OPEN MAX
Gain curve
CLOSE MIN
Dark
Controlled
by gain
Bright limit which controllable
for this unit
Data Setting value
0E F5.2
0D F5.6
0C F6.2
0B F6.8
0A F7.3
09 F8
08 F8.7
07 F9.6
06 F10
05 F11
00 CLOSE
Iris curve
Bright
Controlled by Iris
Data Iris Gain
29* F2.0 48 dB
28* F2.0 45 dB
27* F2.0 42 dB
26* F2.0 39 dB
25 F2.0 36 dB
24 F2.0 33 dB
23 F2.0 30 dB
22 F2.0 27 dB
21 F2.0 24 dB
20 F2.0 21 dB
1F F2.0 18 dB
1E F2.0 15 dB
1D F2.0 12 dB
1C F2.0 9 dB
1B F2.0 6 dB
1A F2.0 0 dB
19 F2.0 0 dB
18 F2.2 0 dB
17 F2.4 0 dB
*When high sensitivity mode is on.
When switching from the Shutter Priority mode to the
Bright mode, the shutter speed set in the Shutter
Priority mode is maintained.
Gain Limit Setting
The gain limit can be set at the Full Auto, Shutter
Priority and Iris Priority of the Auto Exposure Mode.
Use this setting when you want to obtain image in
which signal-to-noise ratio is particularly important.
Gain Point Setting
Set the Gain Point in the middle between 0dB and gain
limit. The shutter speed can be changed from the point
when the set gain value is reached. When you want to
obtain the motion-priority image, use this setting.
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 is computed so that
the 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.
The level is calculated by the value of the surrounding
blocks (shaded) including the designated center block
(black). The range of the Spot AE frame is fixed to 5
blocks vertically and 4 blocks horizontally.

Data Iris Gain
16 F2.6 0 dB
15 F2.8 0 dB
14 F3.1 0 dB
13 F3.4 0 dB
12 F3.7 0 dB
11 F4 0 dB
10 F4.4 0 dB
0F F4.8 0 dB
0E F5.2 0 dB
0D F5.6 0 dB
0C F6.2 0 dB
0B F6.8 0 dB
0A F7.3 0 dB
9 F8.0 0 dB
8 F8.7 0 dB
7 F9.6 0 dB
6 F10 0 dB
5 F11 0 dB
00 CLOSE 0 dB