A second shooter is a second professional photographer who is there to capture everything that the main photographer can’t, extra angles, or if the photographer is already busy shooting some thing else. The second shooter is commissioned by the main photographer, and shoots for the main photographer. The main photographer still owns all the copyright of the second shooter’s images.
An assistant is some one who helps to carry the photographer’s gear, move things out the way, drive around and run errands. Some times the assistant will be a young photographer learning and will be taking photos too, but the main photographer will not rely on these images as these are just for the assistant to learn and practice. All current wedding bookings include an assistant, but any bookings from June 2016 will include a second shooter.