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Functional principle of the joker² light barrier system
Copyright eltima electronic 2022
Wake-up
Name:
wake-up
, Levels:
,
,
,
Default setting: 0 s
Some camera models as well as some speedlights have a power saving fea-
ture, which put these devices into a sleep mode after a certain period of in-
activity. They are not suitable for light barrier photography if they are asleep.
Sometimes this setting can be turned off on the camera or speedlight. Oth-
erwise, the wake-up function can be used to keep such devices constantly
awake. It activates the camera, by “pushing the release button halfway”, i.e.
switch 1 is turned ON, in an adjustable time interval thus keeping the camera
in the wake state.
Speedlights cannot be kept awake directly, but only if they are attached to
the camera and speedlight is activated periodically.
The value of the parameter determines the time interval in seconds in which
the measurement function of the camera is activated (halfway button push).
If the value is zero, the function is switched off.
range
unit
step
0- 99
s
1 s
Keep-active
The keep-active function is a part of the
wake-up
function. It is activated by
setting the
wake-up
parameter to the value
99
.
Most cameras have two modes of operation: active and stand-by.
The active mode begins when the shutter button is pressed halfway
and ends, depending on the camera model, either just after release of
the button, or about 5 to 10 seconds after the release of the button.
During this time e.g. the viewfinder display of the camera lights up.
After the display is turned off, the stand-by starts.
If the cameras are triggered while they are in the active mode, the lag
time of most cameras is much smaller as if they were triggered from
stand-by mode.
By activating the keep-active function, the camera is put into the active mode
after the training process and after the specified light barrier is interupted
once. This state is maintained until the light barrier is interrupted again. The
interruption will release the camera. After that, the output waits for about
1.5 seconds and the camera is put into active mode again.
The keep-active mode is therefore a very important function in order
to significantly reduce the shutter lag of many cameras.