Measurement methods
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Example
LED-Panel settings:
Operating mode TRIGGER EXT
Exposure time (1/x s) 1/10 sec
Shutter lag without autofocus time: LED N
o. 2 lights up → 0.2 s
Shutter lag with autofocus time: LED N
o. 32 lights up → 3.2 s
Autofocus time = 3.2 s - 0.2 s = 3 s
4.3 Exposure Time
Exposure times of cameras can be measured with the aid of the LED-Panel. When the LED-
Panel is set to CONTINUOUS trigger mode and the time is adjusted, a picture of the LED-Panel
is taken. The exposure time can be read by analyzing the lit LEDs.
Example
Camera exposure time: 1/10 s
LED-Panel settings: 3.00 ms / 333 Hz
34 LEDs are lit
Exposure time: 34*3.00 ms = 102 ms (~ 1/10 s)
4.4 Video recording rate / Frame rate
This mode makes the frame rate measurement of video recording devices possible. The LED-
Panel is set to the frame rate mode
“Frame rate” and is being recorded on the camera. The
frequency of the LED-Panel must be now counterbalanced with the rotary knob until the lower
row of LEDs stops blinking on the camera display. The frame rate of the camera has now been
matched by the LED-Panel. The manual frequency scan should be started at the lowest level
because harmonics of the frame rate frequency also cause the LEDs to stop blinking.
