I shoot marching band head shots and shoot 130-150 students in succession. So I do not have a lot of time with each student. In this case the client wants the orange back ground and they want the uniform in focus. The course I just watched suggests to shoot at f/2 to f/2.8 (which I will now try) but I am thinking f/4 might get me where the client wants the images to be. I am also not allowed to crop the image in the hair. Any suggestions? Thank you.