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Controlling image capture
OSCAR Technical Manual V2.4.0
110
Joint shutter
Use Format_7 Mode_0 when a strobe light flashes moving objects. The
exposure for the two (three: F-810C) fields starts concurrently so that the
strobe freezes odd and even lines at the same time. Field one is read out first,
field two (and three) are read out after field one. Make sure that the ambient
light can be neglected, otherwise it will contribute to the illumination of the
scene and introduce image oddities.
The following diagram illustrates this mode.
Figure 50: Joint shutter mode
Note
L
• Changing the shutter time only affects the first field.
The second (and third) field has a constant shutter time
of one (two) field length(s).
• Combining joint shutter with one-shot operation, it can
also be seen from the above figure that the frame rate
in one shot mode is lower than in continuous mode.
This is a result of the additional delay of one or two
(Oscar F-810C) fields before the progressive output of
the camera can start.
External trigger input (after inverting optocoupler)
Shutter first
field
Output first field to camera
buffer
Single shot: time between trigger and availablity of image
Output second field to
camera buffer
Shutter first
field second
frame
External trigger input
Shutter second field
Cont. mode: time between trigger and availablity of image
Progressive output of camera