Issue:
Dragonfly timing characteristics (integration and shutter times).

Solution:
For a low-resolution Dragonfly (640x480) the time from the external trigger going low to the integration time starting is 6 microseconds; for a high-resolution Dragonfly (1024x768) this time is 10 microseconds.

When using multiple cameras, the timing of one camera to another camera is as follows:

1. If the cameras are on the same bus, the cameras are synchronized to within 125µs (microseconds) of each other (please note: 125µs is the maximum deviation). However, bandwidth limits the maximum number of cameras that can be on one bus.
   
   
2. If the cameras are on separate buses, a sync unit is needed to synchronize the buses. The sync unit can synchronize cameras on different buses within the same computer, or on different buses across multiple computers. This device will ensure that the cameras are synchronized to within 125µs. If there is no sync device, there is no timing correlation between separate cameras on separate buses.

Related Articles:
1.) Calculating Dragonfly gain and shutter settings
2.) Can I externally trigger my Dragonfly camera even with multiple cameras on the bus?
3.) Connecting more than 2 cameras to a 2-port IEEE-1394 card.
4.) Time between software asynchronous trigger and start of integration.