Sony EVI D70 Technical Manual - Page 10

Exposure Compensation, Aperture Control, Back Light Compensation, Slow Shutter - Auto/Manual - camera controller

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Basic Functions 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 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 90% and the rest should be set to 10%. Horizontal 16 0 1 2 3 4 5 6 7 8 9 ABCDEF 0 1 2 Vertical 16 3 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 0E 0D 0C 0B 0A 09 08 07 06 05 04 03 02 01 00 Step 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 Setting value 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 Aperture Control Aperture control is a function which adjusts the enhancement of the edges of objects in the picture. There are 16 levels of adjustment, starting from "no enhancement." When shooting text, this control may help by making the text sharper. Back Light 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. Slow Shutter - Auto/Manual When the Slow Shutter is set to "Auto," this ensures that the slow shutter is engaged automatically when the brightness drops. This occurs only when the AE mode is set to "Full Auto." "Slow Shutter Manual" is the factory setting. ICR (IR Cut-Removable) Mode An infrared (IR) Cut-Filter can be disengaged from the image path for increased sensitivity in low light environments. The ICR will automatically engage depending on the ambient light, allowing the camera to be effective in day/night environments. If you normally set the IR Cut-Filter to OFF, the image will be black and white (monochrome). 10

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10
Basic Functions
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 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 90% and the
rest should be set to 10%.
Horizontal 16
Vertical 16
0
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
1
2
3
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
10.5 dB
0D
6
9 dB
0C
5
7.5 dB
0B
4
6 dB
0A
3
4.5 dB
09
2
3 dB
08
1
1.5 dB
07
0
0 dB
06
–1
–1.5 dB
05
–2
–3 dB
04
–3
–4.5 dB
03
–4
–6 dB
02
–5
–7.5 dB
01
–6
–9 dB
00
–7
–10.5 dB
Aperture Control
Aperture control is a function which adjusts the
enhancement of the edges of objects in the picture.
There are 16 levels of adjustment, starting from “no
enhancement.” When shooting text, this control may
help by making the text sharper.
Back Light 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.
Slow Shutter – Auto/Manual
When the Slow Shutter is set to “Auto,” this ensures
that the slow shutter is engaged automatically when the
brightness drops. This occurs only when the AE mode
is set to “Full Auto.”
“Slow Shutter Manual” is the factory setting.
ICR (IR Cut-Removable) Mode
An infrared (IR) Cut-Filter can be disengaged from the
image path for increased sensitivity in low light
environments. The ICR will automatically engage
depending on the ambient light, allowing the camera to
be effective in day/night environments.
If you normally set the IR Cut-Filter to OFF, the image
will be black and white (monochrome).