Sony Digital betacam DVW-970, Руководство по эксплуатации

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60
Setting the Electronic Shutter
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frames (1/2 sec for the DVW-970, 2/3 sec for the DVW-
970P).
EVS (Enhanced Vertical definition System) mode
This mode is used to improved vertical resolution.
However, the sensitivity and dynamic range are reduced.
The shutter speed is set to the same value as that currently
selected in Standard or ECS mode.
• Whatever the operating mode of the electronic shutter,
the sensitivity of the CCD decreases with increasing
shutter speed.
• When the automatic iris is used, the iris opens wider as
the shutter speed increases, thus reducing the depth of
field.
• Under artificial light, particularly fluorescent or mercury
lamps, the light intensity may appear to be constant, but
the red, green, and blue intensities are actually changing
in synchronization with the frequency of the power
supply causing flicker. Using an electronic shutter under
such lighting could make the flicker even worse. Color
flicker is particularly likely to happen when the power
supply frequency is 60 Hz (with the DVW-970) or 50 Hz
(with the DVW-970P). However, if the power frequency
is 50 Hz (with the DVW-970) or 60 Hz (with the DVW-
970P), setting the shutter speed to 1/100 or 1/60 can
reduce this flicker.
• When a bright object is shot in EVS mode or ECS mode
in such a manner that it fills the screen, the upper edge of
the picture may have poor quality because of an inherent
characteristic of CCDs. Before using EVS mode or ECS
mode, check the shooting conditions.
You can turn on or off the EVS mode on the SW STATUS
page of the PAINT menu.
4-2-2 Selecting the Shutter Mode
and Shutter Speed
Use the SHUTTER selector to select a shutter mode or a
standard-mode shutter speed. To set the shutter speed in
ECS or SLS mode, with the SHUTTER selector set to ON
and the ECS or SLS mode selected, use the MENU knob
for adjustment.
You can use the SHT ENABLE page of the OPERATION
menu to narrow the range of choice in advance, or to select
in advance whether or not you use ECS/SLS.
Setting the shutter mode and the shutter
speed in standard mode
Once the shutter speed is selected, it is retained even when
the camcorder power is turned off.
1
Follow the procedure described in “5-2-2 Selecting the
Display Items” (page 79) to set the VF DISPLAY
MODE item to “2” or “3” on the VF DISP 1 page of
the USER menu.
2
Push the SHUTTER selector from ON to SEL.
The current shutter setting indication appears for about
3 seconds in the setting change and adjustment
progress message display area of the viewfinder
screen.
Examples: “: SS : 1/250,” “: ECS : 60.00 Hz”
3
Before the shutter setting indication disappears, push
the SHUTTER selector down to SELECT again and
repeat this until the desired mode or speed appears.
Pushing the SHUTTER selector down to SELECT
repeatedly allows you to cycle through the settings of
mode and speed preselected on the SHT ENABLE
page of the OPERATION menu.
Note that all modes and all standard-mode speeds
listed in the table on the previous page are preselected
using the SHT ENABLE page of the OPERATION
menu.
By factory default, all available shutter modes and
shutter speeds are displayed in the sequence shown in
the following figure. (You can use the SHT ENABLE
page of the OPERATION menu to make a setting so
that only the desired (or most frequently used) modes
and speeds are displayed.)
Notes
SHUTTER selector
Standard mode
ECS mode
1/100: for the DVW-970
1/60: for the DVW-970P
SLS mode