There used to be of course 'journalist' photographers at every gig. But Queen also had their own home-live-photographer. Damn, his name just won't come to my mind right now. Have to check when I get home, but I'm sure someone else in here can name him straight away. He had a book out a couple of years ago with lots of his greatest pics from all Queen era's. Very nice!
The name is
Dennis O'Regan
he took a pic of Queen for the first time at Hammersmith Odeon in 1973, if I'm not wrong, as private fan... then he sent some of his shots to the band and he later became their tour photographer.
I really suggest his book to everyone, it's called "The full picture" and it features pics from almost every tour, from 1977 on.
cheers!