GRASS VALLEY LDX 150 - Lighting Correction; V-Shift (Vertical Acquisition Shift)

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LDX 150
User Guide
On the camera, exposure time is selected by the exposure time switch on the left side panel
of the camera:
The exposure time switch gives a choice of exposure time settings. If an exposure time
other than nominal is selected, the non-standard indicator in the (ocular) viewfinder lights.
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Note
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Note
Decreasing the exposure time lowers the camera’s sensitivity proportionally.
• Nom — nominal setting
• Var — enable the exposure time to be varied
• 1/200 — for fast moving objects
• 50 Hz — shooting under 50 Hz lighting (adjustable with lighting correction)
• 60 Hz — shooting under 60 Hz lighting (adjustable with lighting correction)
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.
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.
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