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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.”
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
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