jd40 wrote in post #5582794
Since this thread is similar to the question I have in mind, I'm just going to tag along.
If I'm at the wedding as a guest shooter, do I have to talk to the hired photog? It's different if I use the P&S, but if I lug a DSLR around and try to take nice pictures that the couple might use in the end, do I owe anything to the photog?
Touchy subject. Don't get in the paid guys way, be polite. Don't use a flash or remote transmitters when he/she is using either. Basically, don't compromise the 'hired' shots. That's not fair to anyone 
Provided these things, you owe him nothing. Take all the pics you want, do with them whatever you like. If he/she gets uppity and rude (which does happen, and is absurd, considering they've already been paid), do what you can to not disrupt or otherwise cause fuss on your friends wedding day. However, do remember you are not doing anything wrong.
All that said, I suggest you speak with the B&G so they can inform the hired photographer that you will be there as a friend, staying out of his way, and not affecting him otherwise. That way, all is cleared up beforehand, and everyone snaps in peace.
Hope that helps.
Edit: Most wedding photogs are pretty cool. You'll likely end up talking gear and whatnot during shared downtime. At my own wedding, I was borrowing bodies and lenses from my photog and shooting with him and his assistant =) Good times.