If all that is required is flashes to be fired, why did they use all those cameras?
Unless it was all for show. It certainly looks cool/impressive to see all those camera with flashes attached.
I know if I would have done that setup (well I would likely use CGI, but I digress) I would just trigger the flash directly. The camera is an unnecessary expense, and likely one more thing that needs to cared for, especially when we're talking 250 parts.