GRASS VALLEY LDX 86 HS - Lighting Correction; V-Shift (Vertical Acquisition Shift); Variable Exposure Time

LDX 86 HS/XS HiSpeed/XtremeSpeed HD camera User’s Guide (v1.0) 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.
Press the EXP. TIME button and set EXP SEL to Var. Now change the VAR EXP to remove the
horizontal bar. You can set the EXP UNITS item on the next page to the preferred read-out: Hz
or mSec.
When you are finished shooting the monitor go to the EXP SEL item and switch it back to
Nom. The exposure time returns to its previous non-variable setting.
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.
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Note
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Note
When Variable Exposure is switched on, the non-standard indicator in the viewfinder lights
(only for ocular viewfinders).
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OCP
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