It's so fun to watch my daughter play at the park. If there are other kids there she instantly loses all interest in me and wants to play with them. If I want to take pictures as she is running around then I'm gonna get tired chasing her around. It's much easier if I throw the 300mm lens on and just sit back and shoot. One of the great things about this method is that she doesn't care nearly as much about the camera, allowing me to get wonderful moments like this, where she is helping this boy get up to the fountain.