He has a very good camera. Good Lord. What happens if he gets stuck into the grog before or during the wedding? Doesn’t have a back-up camera? Shoots into the sun? Runs out of battery or film? Chops everyone’s heads off?
Well you probably could come up with a million pros and cons! Perhaps you should suggest to your Uncle Fred to bring his camera to back up the pro. That way, he’ll probably get some brilliant informal shots – and it doesn’t really matter if he does indeed get gloriously sloshed!