In many countries there is a tradition of large weddings. They work 2-3 photographers. One takes pictures of the "format" official part, which must be. The other catches emotions in young people and guests, sometimes arranges performances. The third photographer works as an assistant and an additional pair of hands. Thus, the completeness of the coverage of the plot is achieved.
In our country at weddings, as a rule, one photographer works. Sometimes an assistant helps him. In fact, one photographer tries to keep up with the general line of the day. Of course, with such intense activity of the photographer in the whole process of the wedding, one should immediately ask himself a question.
I read it here:
http://color-foto.com/свадебный-фотограф-в-москве-10000-руб/