© 2016 Thorlabs Scientific Imaging
2 Camera Basics
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Flash timing with global shutter sensor, automatic flash,
optional trigger delay
Flash timing with rolling shutter sensor, automatic flash,
optional trigger delay
Manual flash synchronization
If one of the flash delay or flash duration parameters is set to a value greater than 0, you can shift
the flash signal to any point in the exposure time or change its duration. In this case, the flash delay
will be calculated exactly from the start of the exposure time (after the sensor latency time). When
manually synchronizing the flash signal to the exposure time, you can use the is_IO() function to
query the data you need.
The advantage of manual flash synchronization is that the flash can be precisely controlled based
on the start of exposure. This applies to both rolling and global shutter sensors. You can thus
achieve a higher accuracy with the manual flash synchronization than with the automatic flash
feature.
The disadvantage is that the flash signal has to be resynchronized whenever any settings for image
geometry or camera timing change.
Note
With rolling shutter sensors, you can avoid the rolling shutter effect by selecting suitable delay and
duration settings (global flash function). Using is_IO(), you can query the appropriate values.
Note
The flash output is reset with the start of the next image capture. This also applies if you have set a
longer flash duration.
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