20.5 Working with I/Os 245
20.5.2 Compensating delay of strobe or flash
Normally, the input circuitry of flash has a delay (e.g. low pass filtering). Using "ExposureActive" to fire strobe
would actually illuminate delayed with respect to exposure of the sensor. Figure 2 shows the problem:
Figure 2: Flash delay with "ExposureActive"
To solve this issue, you can use following procedure:
1. Do not use "ExposureActive" for triggering strobe.
2. Build flash signal with Timer,
3. trigger Timer with external trigger (e.g. "Line5").
4. Use "Trigger Delay" to delay exposure of the sensor accordingly.
In wxPropView (p. 74) it will look like this:
Figure 3: Working with Timer and "Trigger Delay"
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