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Strangely enough its just a property: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000004Aa2SAE I dont know if we are thinking of the same thing, but what came to mind with software triggering was this procedure: Change trigger mode on camera to software trigger Read buffer # Set exposure time read back exposure time (poll until = new value) fire software trigger ignore that new image turn trigger mode back to hardware triggering (or free run if thats what you use). Seems like this would be a pretty fool-proof way of ensuring the change? If it works you can then start removing things (for ex I think 5/6 are redundant since you paused triggering in 1)

Many cameras have a soft trigger function. Maybe you could count images vs soft triggers before the exposure change to figure out the exposure of each image.