I have a point and shoot sony digital camera (dsc-p72), but it just doesn't cut it for shooting me and my buddies surfing. The zoom is only 3x. I was gonna sell it and get a better digital with a 10x zoom or so, but my buddy suggested I get an older film SLR with a big lens. I want to shoot surfers from the beach (I guess it'd be about 100 yards or so). Would getting an older SLR be good for that, and how big of a lens would I need? Thanks for the help!