You hold in the '+' and the '-' buttons together for 2 seconds until the second curtain symbol comes up on the LCD, jobs a goodun'
I've looked everywhere, but i really cannot get it to work, im really going to scream.
Any ideas?
-neoni
P.s- the flash is on manual, and the camera, and its set under custom options!
Weird, that's how you do it on the 540EZ - the 550EX even has the icon underneath the buttons..
picture: http://k43.pbase.com/v3/90/458590/1/48863195.550ex.jpg
it's the '>>>' type symbol you're after above the charge led
Second-curtain sync with the 550EX is set on the flash itself whether it's used with the 40D or any other EOS camera. To set it up, press the + and - buttons on the back of the 550EX twice simultaneously. Look for the second-curtain sync icon in the upper right corner of the 550EX's LCD panel.
Second curtain flash is only available when when a 550EX is attached via hotshoe connector, and not in Master or Slave mode.