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Message: <blockquote data-quote="kimst12" data-source="post: 326347" data-attributes="member: 27451">I am using 2 D5100s for an application where timing is critical.  I took apart 2 remotes and wired them together so the 2 cameras fire at the same time.  I also feed the shutter trigger signal into a DAQ, to be used with the signal from other parts of the system.  My first question is whether the shutter is opened on the rising or falling edge of the trigger signal.  Using the remote, the duration of the trigger signal is variable, but on the order of 1/10th of a second.  I assume the shutter opens on the falling (ie leading, since there are 5 volts, and when shorted it drops to 0) edge, but I've been unable to verify that for sure.  My other question is if anyone sees any potential problems with this setup, particularly syncing the shutters of the 2 cameras this way.  Thanks!Kim</blockquote>