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Functional principle of the joker² light barrier system
Copyright eltima electronic 2022
Lag time measurement
Name:
meas lag
, level:
Values:
no,
yes
Default setting:
yes
The jok
e
r
²
light barrier system, can measure the shutter lag of cameras or
flash units.
yes
: Measuring function is active.
no
: Measuring function is switched off.
To measure the lag time, proceed as follows:
First set up a light barrier, connect it to slot 1 and carry out the training
process (changing from the alignment level to the working level). The
light barrier system is now active.
Attach a flash unit to your camera or flip the built-in flash.
Connect the camera to the output a, and make sure that output a is set
to be triggered by light barrier 1 and that the “lag time” for output A is
set to 0.
Point the flash unit at the controllers display at a distance of approx. 40
to 80 cm.
Interrupt the light beam of the light barrier system. The camera will be
released and the flash will fire. The device now measures the time be-
tween the triggering of the camera, and the arrival of the flash light on
the display of the controller.
Read the lag time from the display of the light barrier, for example:
td=145.60 ms
. If no camera is connected or the flashing light does not
reach the display within two seconds, the display shows:
Td=-----ms
.
Some camera systems fire a pre-flash to measure the exposure. This
function must be switched off when measuring the lag time! Since the
pre-flash fires before the shutter is opened, it would falsify the meas-
urement result towards shorter lag times.
Displaying the X-Parameters
Name:
exp mode
, level:
Values:
no,
yes
Default setting:
no
no
: The levels
-
for experimental photography will be hidden. The sys-
tem level follows immediately after the level for output d.
yes
: The levels
-
for experimental photography will be displayed.