© 2013 Thorlabs GmbH
4 Programming (SDK)
391
4.5.9 is_GetGlobalFlashDelays
Syntax
INT is_GetGlobalFlashDelays (HIDS hCam, ULONG* pulDelay, ULONG* pulDuration)
Description
Attention
This function is obsolete and should not be used anymore. We recommend to use the is_IO() function
instead (see also Obsolete functions ).
Rolling shutter cameras:
Using is_GetGlobalFlashDelays(), you can determine the times required to implement a global flash
function for rolling shutter cameras. This way, a rolling shutter camera can also be used as a global shutter
camera provided that no ambient light falls on the sensor outside the flash period.
If the exposure time is set too short so that no global flash operation is possible, the function returns
IS_NO_SUCCESS.
Note
To use a rolling shutter camera with the global start function, call the is_SetGlobalShutter() function
before is_GetGlobalFlashDelays(). Otherwise, incorrect values will be returned for Delay and
Duration.
Global shutter cameras:
In freerun mode, the exposure of global shutter cameras is delayed if the exposure time is not set to the
maximum value. is_GetGlobalFlashDelays() determines the required delay in order to synchronize
exposure and flash operation. In triggered mode, the return values for delay and flash duration are 0, since no
delay is necessary before exposure starts.
For further information, please refer to the Camera basics: Shutter methods chapter.
Input parameters
Pointer to the variable that returns the flash delay in µs.
Pointer to the variable that returns the flash duration in
µs.
Return values
Function executed successfully
Related functions
is_SetFlashStrobe()
is_SetFlashDelay()
is_SetTriggerDelay()
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