Unlock setting on Cannon Speedlite 580EX II

Caroline, you should try to set the camera on "M" and the flash in 2nd curtain flash sync.

Or set flash in ATG wireless IR ETTL Slave modes and pop-up the flash on Canon EOS-70D.

Truly,
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You must disable the 580EX II form using the 4AA.

4AA must be needed when using hv power pack.

Just let the 4AA use & display the LCD panel.

More help, repairs & troubleshooting send me an email.

atdlee@netzero,com

What camera model are you using?
Try this:
1. How flash on camera.2. How USB cable to camera to Window PC.3. Run my software (EOS Utility)4. Click on Camera Settings/Remote Shooting5. Click on flash menu.
Any questions?
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580EX:
http://downloads.canon.com/cpr/software/camera/580EX.pdf

580EX II:
http://downloads.canon.com/cpr/software/camera/Speedlite-580EXII.pdf

To reset the C.Fn settings on the flash just go into C.Fn mode and set each setting to 0.
If there is no C.Fn icon showing, the flash is at it's factory default setting.
Hope this helps :)

It would appear to me that the flash was not locked in position and has move back on its mount which would cause the flash to go into complete manual mode or loose complete communications between camera and flash.
I would suggest shutting the camera and flash off remove the flash first unlock the little locking leaver on the bottom. The 580EX and the 580EX II differ in that the 580EX II has a leaver rather then the huge locking screw. Once apart reinsert the flash unit back into the camera hot shoe making sure that the forward edge of the flash mount is seated as deep into the Hot Shoe as possible and lock it into position. It should click into lock position. Biggest thing I have with my "crew" is when there is a flash installed on the camera they pick the camera/flash unit up by the flash that's a real bad thing cause the flash mount is light plastic and it'll ether break, twist or even unlock the flash enough that the camera falls off of the flash. Pick the assembly up with both hands lens and body. I'm not saying you are doing this but when my crew/working associate's do this I'm not happy.
Although that new switch idea is great it also can be unlocked without noticing.
Diagram

hi Colin

these r some fantastic article which gives an indepth knowledge about best flash settings,kindly go thru the links below:-
http://www.gumtree.ie/dublin/26/37496226.html

http://www.amazon.com/Canon-430EX-Speedlite-Flash-Cameras/dp/B000AO3L84

http://www.wonderhowto.com/how-to-tutorial-for-canon-speedlite-580ex-ii-flash/
hope u will b helpfull
all the best
regards

Perhaps the unit is set to master/slave mode. Look into that.

hint: Press and hold on the zoom button to get into the master/slave menu

canon 580EX [I or II]

if u set the 580ex on master and the 430 EX on slave it works :) u dont need STE2 for this simple task.