you should send individually and they don't sign authentic, some do though. Katie Leung, cho chang, might sign authentic, daniel radcliffe only signs for charity, and a lot of the adult cast sign. the actress that plays Professor McGonagall might sign authentic, and the one that plays Mrs. Weasly also might. I've seen Mathew lewis, Neville, and the one that plays Ginny sign authentic. Daniel, Emma, Rupert, Robbie Coltrane, send pp

OK so i really want to get all the Harry potter actors autos while there shooting the next movie, does anyone know if they sign authentics on the set or do they still sent out preprints? should i send each request in its own envelope? and if i want more than one actor to sign a photo how should i address the envelope?... to each actor i want to sign , or just to the cast?

Thanks!
-Lexie