Ok so I have a wedding shoot in just under 3 weeks. Its a proper full day wedding shoot. Other weddings I've done have been minor. A registry office and a blessing, not a "real" wedding. I have my 30D + 24-70 + 430ex and I was thinking my 10D + 100-400 as its the only zoom I have. Am I overreacting looking to buy a 70-200 f/4 instead of taking the 100-400? I think the 100-400 is overkill and it'll be f/5.6 at 400mm. I guess I could look at Calumet for a rental. I don't *do* weddings for this reason. Its such an important day I just don't want that responsibility, even if I am a half decent photographer. I'm still human and shy.