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9
Basic Functions
AE – Iris Priority
The iris can be set freely by the user to 18 steps
between F1.8 and Close.
The gain and shutter speed are set automatically
according to the brightness of the subject.
parameter IRIS (F1.8) F No. parameter IRIS (F1.8) F No
11 F1.8 08 F8.0
10 F2.0 07 F9.6
0F F2.4 06 F11
0E F2.8 05 F14
0D F3.4 04 F16
0C F4.0 03 F19
0B F4.8 02 F22
0A F5.6 01 F26
09 F6.8 00 CLOSE
AE – Manual
The shutter speed (21 steps), iris (18 steps) and gain (8
steps) can be set freely by the user.
AE – Bright
The bright control function adjusts both the 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,” the user can switch it to “Bright.”
When switching from the Shutter Priority mode to the
Bright mode, the shutter speed set in the Shutter
Priority mode is maintained.
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 following diagram on the next page, 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
Gain
Dark Bright
IRIS gain curve
Controlled
by gain
Controlled by IRIS
Bright limit controllable
for this unit
MIN
MAX
AGC
CLOSE
OPEN
IRIS
AGC gain curve
Parameter IRIS (F1.8) GAIN
F No.
17 F1.8 18dB
16 F1.8 15dB
15 F1.8 12dB
14 F1.8 9dB
13 F1.8 6dB
12 F1.8 3dB
11 F1.8 0dB
10 F2.0 0dB
0F F2.4 0dB
0E F2.8 0dB
0D F3.4 0dB
0C F4.0 0dB
0B F4.8 0dB
0A F5.6 0dB
09 F6.8 0dB
08 F8.0 0dB
07 F9.6 0dB
06 F11 0dB
05 F14 0dB
04 F16 0dB
03 F19 0dB
02 F22 0dB
01 F26 0dB
00 CLOSE 0dB