Why are photographers so sensitive about guests taking pictures?
When “the photographer is trying to work quickly through a series of formal pictures, a snap-shooter might slow the process. A problem arises when there are several cameras aimed at a formal group – the subjects will be looking at different lenses. The diverted attention will ruin the professional’s picture. Or, if the professional is using a light-sensing trigger device (“slave”) on a second flash, other flashes will trigger this flash, ruining the pictures [that you are paying for] and wasting battery power. There are many other reasons why a professional might ask others to refrain from picture taking during formals. On the other hand, many guests find snapping a few pictures a pleasant part of attending weddings, so it should not be a big deal for your professional to be relaxed and let people snap away when formals are over.