I have been trying to take pictures of my neice in the house and I can't seem to get them right. Most of them end up blurry because she is moving around so much. I am shooting her with a 70-210 in Av mode with the lens wide open at f/4. I guess with the available light, the shutter speed just isn't fast enough, I even bumped the ISO up to 800/1600. Here's what I got in my bag: Canon XT 28-70mm f3.5-4.5 70-210mm f4 50mm f1.8 18-55mm Kit lens I'm thinking that a good portion of my shots that I will be taking will be of family and friends indoors, and most of the outdoors shots will be while I am on vacations. Does it sound like the Flash is the way to go here?