I'm not sure what exactly it's called... but I was wondering if I could (push/pull?) my Fugicolor Press 400 print film to 800 on my camera.? I am going to a concert later in the month and I was wondering what I could do to get less movement in the low light conditions. I want to set my camera to 800iso but use 400iso. Is there a better way? What do I tell the camera store when I go to develop it? What's this procedure called? Thanks!