So tomorrow I'm going to be shooting probably over 100 pictures for my buddy's band. I've got a canon Rebel XTI with a 18-55mm f3.5-5.6 and a 50mm f1.8 lens. I wont be very far from them, (we'r talking about two arm distances or so away). Lighting is far from good in this place so i'm leaning towards the 50mm because of that reason but thinking it'll be tougher to get full body shots. I have no problem taking both lenses its just switching could be a bit tough in this situation. any recommendations?