HELP! Canon 5dsR+580EX flash-are they compatible?

I cannot get my 580 flash to work properly with my 5dsR

it over exposes hugely no matter what settings I use.

I'm sure it used to work but last time I used it was for my daughters graduation 3 years ago.
Now friends are getting married and I can't make it work

What have I forgotten what am I doing wrong- Ive been through the manuals and tried every settings

Hi, Should be compatible. Is the over-exposure strictly flash illumination alone or ambient & flash combined?
Is HSS not enabled when your test shot circumstances demanded it?
Does the flash screen say ETTL or TTL?
For further test shots set cam to M & flash to ETTL with zero FEC & try again.
With luck it will be easy to sort. Maybe reset your cam's flash menu screen.

If the flash foot pins aren't all making contact with the pads on the flash hotshoe, in TTL the flash will fire at full power. I say check that you've got the 580EX seated fully forward in the camera's hotshoe and that the flash foot and camera hotshoe are both clean and unobstructed.

HA!

good troubleshooting!!

that's exactly the problem. Checked the seating out and there was some CHOCOLATE stuck in there!

thanks all

I Simonius wrote in post #18852555
HA!
good troubleshooting!!

Good reporting! If you haven't mentioned the massive overexposure, I wouldn't have tried to guess. You'd be amazed how many people on messageboards want you to figure out what's wrong without actually bothering to describe what's wrong.

I'm not gonna ask how the chocolate got in there.

LOL

Thanks again