his secrets for taking the best wedding pics. >> never put uncle harry up front. >> reporter: why? >> because he's crazy. everybody knows it. always put him in the back of the group photographs. >> reporter: mcnally should know. in the last 30 years, he's photographed countless magazine covers and portraits. >> everybody's good! everybody's good! nice job! >> reporter: the idea for the wedding truck studio came when he accompanied friends to their nuptials at city hall. >> a lot of folks were there, and you know, they were getting mom and dad kind of like, okay, look this way. you just know the pictures aren't going to be that great. >> reporter: so, what does make a photo great? a lot of people go to weddings and just snap pictures with their phones. so, what can you do to get the best picture out of that? >> don't shoot it with your phone. >> reporter: tip number one, use an actual camera. >> i realize that's kind of the thing of the moment, you know. people are recording their lives on their smartphones and what not, but there's a difference between those kinds of photographs and a photograph you're going to remember. >> reporter: tip number two, build a frame. >> people tend to get back, back, back, so they get everything in. and then at the end of the day, they've get nothing in, because