I have a canon EOS 5 and speedlite attachment. In sunny conditions when I am doing close up portrait shots, the flash will not fire which means I'm getting shadowy faces! I assume the camera is deciding that the shot will be overexposed and is refusing to take the photo! How can I get round this? I used to have exactly the same camera and flash years ago and never had this problem - Is there something obvious I'm forgetting to do? Have read manuals for both camera and flash and not found anything to help! Would be really really grateful for any pearls of wisdom - I'm shooting a friend's wedding in a few weeks time!