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5-6 Operator's Manual LDK 100 Camera Head Shooting
Sometimes when shooting TVs or computer monitors
a horizontal noise 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 noise bar.
The ranges for FT cameras are:
from 50.6 to 103.1 for 50Hz cameras
from 61.1 to 151 for 60Hz cameras
The ranges for IT cameras are:
from 50.1 to 103.1 for 50Hz cameras
from 60.1 to 151 for 60Hz 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 active when the
camera is not genlocked and when it is not on-air.
If the frame frequencies of camera and monitor are
different use the clean scan of the variable shutter
function.
CRT Exposure [FT]
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.
Shooting Screens Exposure Time
The exposure time values of 1/200, 1/500 and 1/1000
(also 1/2000 for IT) 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.
On IT cameras shorter exposure times increase
smear effects 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.
EVR - Enhanced Vertical Resolution [IT]
This exposure mode on IT cameras is used to increase
the vertical resolution especially for still pictures. The
exposure time is set to 1/25 for PAL and 1/30 for
NTSC.