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Bruce, Try these steps: 1. Set camera to manual2. Set shutter to 1/60 3. Set aperture to F5.6 4. ASA/ISO 200 5. 550EX on hotshoe 6. Do not set on slave or master 7. Turn on flash
Display must shows, ETTL. If that doesn't work, you have to use the flash on manual. Some of this model will not work fully on ATG Canon EOS-1D C, ATG Canon EOS-1D X IR, Canon EOS-1D X/60D/T4i because this flash is over 20 years old.
Unless you would want it to be modified by me. But that can be costly when you can get the 580EX II for less than $425.00 USD.
Usually if my flash isn't firing I check to see if the flash is mounted into the hotshoe properly. I take it off the camera, put it back on and tighten it down then test it.
If that doesn't work then check the display of the flash and see what mode you are on or if the display is flashing. If it is flashing then the wide angle adapter may be covering the flash which you will need to take off and put back inside the flash. It's that white plastic tab that slides in and out of the flash head.
Hopefully that will fix it.
I use one of my cams with a sigma 500 DG-ST in a nightclub
ive done 3 of the hot shoe connectors in the last year
look up sigma's website and find the contact info give them a call and they should after some arguing ship you out the parts
every time i have ordered parts they try and get me to send it in for repair even though by the time i am ordering the parts the flashgun is already in bits & i tell them this they keep telling me how dificult it is to do...
for the canon fittment do the following
at the base of the flash remove the 4 screws this removes the bottom section unclip the wireing harness there are 2 screws securing a small metal plate remove them
now there are 4 screws securing the small PCB, remove them, you can now take out the boot from the bottom be careful as the pins and the springs will want to come out pay atention to the locking pin and how its orientated
swap over the broken boot with the replacement then retrace your steps to get it back together