GRASS VALLEY LDX Elite, User Manual

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LDX Series Software Upgradable Camera Platform User’s Guide (v3.1) 69
Chapter 5 - Video setup
5.7.2 Lighting correction
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
positions: 50 Hz and 60 Hz. Each of these positions can be varied further in a range from -10 to
+10 Hz. To reduce flicker select the frequency closest to the frequency of the lights and then
vary the lighting control in the
PRODUCTION SETUP > EXPOSURE > LIGHTING
menu to obtain
the best result.
5.7.3 V-Shift (vertical acquisition shift)
When shooting monitors with (almost) the same display frequency as the camera’s, for
example TV sets, a horizontal black bar can be seen in the viewfinder. This phenomenon occurs
because the camera is blanking while the monitor is not. The V-shift
function shifts the camera
blanking to synchronize it with the blanking of the monitor.
In the camera menu, navigate to the
PRODUCTION SETUP > EXPOSURE > ACQ TIMING
menu
and switch on the
V-SHIFT
item. Use the
V-SHIFT TIME
item to change the time shift until
the horizontal bar disappears.
Tip
✎
V-Shift can also be used to remove color shifts that may occur when shooting DLP-type
projectors.
5.7.4 Variable exposure time
When shooting computer monitors with higher frame rates than the camera’s you can use
variable exposure to avoid horizontal bars in the picture.
Use the exposure time switch on the camera to select variable exposure time. Or, in the
camera menu, navigate to the
PRODUCTION SETUP > EXPOSURE > EXP TIME
menu and set
EXP TIME SEL
to Var. Now change the
VAR EXP TIME
to remove the horizontal bar. You can set
the
UNITS
item to the preferred read-out: Hz or mSec.
When you are finished shooting the monitor go to the
EXP TIME
item and switch it back to
Nom or use the exposure time switch. The exposure time returns to its previous non-variable
setting.
☞
Note
☞
Note
When Variable Exposure is switched on, the non-standard indicator in the viewfinder lights
(only for ocular viewfinders).
CAM
CAM