Optical Slave mode on 580EX

[Dante King]

Ok, before you go tell me to read the manual, I cant find it. I also spent hours looking for a downloadable on on canon's site. No joy.

Is it possible to set the 580 as a optical slave and have it fire when the on camera flash goes off?

[cactusclay]

I don't think so, I think you have to have a 550 or 580 as the master, or one of those other deals that I can't remember the name of right now. However, if I'm wrong, then I would also be interested in know how to do that.

[tim]

I don't think the 580 can act as an optical slave, you'll need the transmitter, or another external flash on your camera.

[mbze430]

Everyone is correct on this. No you can't make ANY EX canon series (older might fall under this) to pop when it see a flash of light. Only way it will pop is with another flash head (Canon/Sigma) or the Canon ST-E2

Forgot to mention a slave optic unit that goes on the hot shoe area.

[Dante King]

Found my manual. Thanks for the replies.

[DavidEB]

Can do this with the Sigma 500 Super. But getting the exposure right is tricky.