Wasted Money!
Some couples are still opting to purchase throw away type film cameras and putting one on every table at the reception. You're wasting your money!
Let’s start with the most obvious. Your photographer should be your first option for this type of work. An experienced photojournalist is the only way to properly capture the spirit of the party.
Throw away type cameras are technically unsuitable and your users are inexperienced so, you'll be lucky if any shots are worth putting in your wedding album!
There's no substitute for an experienced professional. 
