Originally Posted by Peter Zack
I'm going to make an assumption that you will have the one camera and it will be shared between you and your brother. With that, I'll contradict some of what Stu just said (Sorry Stu). I'd recommend you get a good fast zoom (DA*16-50 or Tamron 28-75) and take your 43mm. Get a flash and between now and the big day do some practice shooting at home doing portraits. It's really much easier than it seems with practice. But I would suggest keeping the lens selection as simple as possible. You are only taking the 43 in case you need something faster. But shoot it all with one lens and the Tamron is about as perfect for this as you could ask for. Sharp and fast.
Get a reflector for the flash and you have what you need for a simple and basic setup. If you have specific questions, post back and we'll offer whatever help we can.
Good advice here Peter. Funny that everyone who has seen the photos I took of my son's wedding, liked them better than the ones taken by the guy who helped me out with his canon 5D at the ceremony. He is a paid wedding photographer (the son of a good friend) and he came by for an hour or so and helped at the ceremony. I used the Sigma 17-70 and the Tamron 28-75 (mostly the tamron), I threw on the 43 ltd for a few shots too. I used the onboard flash as controller and held the 540 in my left hand out to my side and over my head, mostly with the flash pointing straight up and the reflector card pulled up. I was beat by the end of the wedding and reception, but I did get images that the friends and family are quite pleased with. I still can't figure out why the k10d images looked better than most of the 5D images? He did absolutely nail a few shots though. He was shooting iso 800 in the church and I was shooting iso 400, we were both using flash but his shots were really noisy. Probably won't be an issue in print though? We'll see soon.
I highly recommend visiting the church and reception area if possible and take some practice shots at the same time of day that the wedding will be. It will go a long way toward making you more confident and comfortable on the actual event day!
Oh, and I am NOT complaining about the 5D shooter. I am really grateful he was there as he set the shots up for the bird seed throw that I wouldn't have got otherwise.