I have been looking at the instructions for the speedlite 580ex here for any idea how to fire the flash from the built in camera flash, but it has not helped.
Does anybody know if it is possible to fire it with a cameras in built flash?
edit
I'm not sure if this has been read incorrectly. If I am not mistaken the flashgun can recognise when a flash goes off (a peak in light) and fire its own flash also?
I was watching a video on youtube where a buzz lightyear camera fired a remote flash gun, by its own flash firing.
Answer
The flash that David Hobby's using in that "cheap camera challenge" video is a Yongnuo YN-460--it has a built in "dumb" optical slave, which is a simple "see a flash burst--fire flash" sensor-based way of triggering a remote flash.
The 580EX does not have this capability. You can add the capability with a Sonia green-based optical slave, but then your main problem is that the 580EX also has no sync port to attach a slave to, so you'd have to get a hotshoe to sync port adapter or modify/replace the flash foot to include a sync port to plug the slave in. At which point you might as well just spend the same amount of money on cheap radio triggers (e.g., Yongnuo RF-603IIs).
What the 580EX has is a "smart" optical slave--one that speaks Canon's wireless flash signalling protocol, which is done with preflashes in the near-infrared range. To use the 580EX as a Canon wireless slave, you need a Canon wireless master unit. These are built into the pop-up flashes of the T3i (600D), 60D, 7D, and later cameras, but not in any of the earlier models. So, with, say, a T2i, you'd have to have a master unit on the camera hotshoe, and that would be an 90EX, ST-E3, 550EX, 580EX, 580EXII, or 600EX-RT. There are some third-party flashes from Metz, Nissin, and Yongnuo that can also be masters, but these are typically going to be the high-end expensive models.
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