RCA LDK 200 - Manual (Page 38)

5-6 Operator's Manual LDK 200 - Multi-role Digital Camera Head Shooting
Shooting Screens Exposure Time
Sometimes when shooting TVs or computer monitors
a horizontal bar can be seen across those screens in
the viewfinder. There are two ways of removing the
noise bar from the picture depending on the frame
frequency of the display. For displays with the same
frame frequency as the camera, for example TV sets,
use the V-shift facility. For displays with a higher frame
frequency, for example computer monitors, use the
Clean Scan facility.
Clean Scan
To use the Clean Scan function press the Clean Scan
button at the front of the camcorder for about two
seconds to directly access the variable exposure
(clean scan) function. Use the rotary control to change
the value and so remove the bar.
The ranges are:
from 50.6 to 103.1 for PAL cameras
from 61.1 to 151 for NTSC cameras
When you are finished shooting the monitor press the
Clean Scan button for two seconds to switch off the
Clean Scan function. (Exposure Time returns to its
previous non-variable setting.)
Note :
Do not shoot highlights in the clean scan mode as
this may cause a smear effect.
V-SHIFT
The vertical shift switch (V-SHIFT) at the front of the
camera is used for displays with the same frame
frequency as the camera, for example TV sets. It is an
up/down type switch. Pressing the switch moves the
black bar up or down so that it is no longer visible in the
viewfinder. This function is only available when the
camera is used stand allone and is not active when the
camera is genlocked or on-air.
If the frame frequencies of camera and monitor are
different use the clean scan of the variable shutter
function.
CRT Exposure
A third possibility can arise when shooting a monitor
whose synchronisation is locked to the camera's.
Stripes might be visible in the picture of the monitor.
(This is more usual with 16:9 cameras.) To remove
these disturbing line pairing effects between monitor
and camera lines, select the CRT option with the
Exposure time switch.
The exposure time values of 1/200, 1/500 and 1/1000
of a second are used to capture fast moving objects so
that these can be played back sharply in slow motion.
The value selected depends on the speed of the
moving object.
Note :
Increasing the exposure speed lowers the camera
sensitivity proportionally.
The exposure selection also includes lighting control
positions which can be used when shooting with
lighting that is operating at a different frequency to the
camera. There are two position 50 Hz and 60 Hz. Each
of these positions can be varied further in a range from
-10 to +10.
To reduce flicker select the frequency closest to the
frequency of the lights and then vary the lighting
control in the system Install menu to obtain the best
result.
Film
The Film function is a variable exposure function with
running shutter. The Clean scan range is wider but with
the Film function higlights will not cause a smear
effect. If the Film function is selected the exposure
time can be set in the Viewfinder menu.