So I do not get flamed like on other forums, yes I have a photo gallery on the internet. No I am not a photographer by trade. I do this as a hobby. Have been doing it about 2 months. I am here to learn more. I am using a D-50 with a nikkor 70-300 I shoot sports photos if paintball tournaments. When shooting and trying to get shots with several players in one shot I get one or more of the players to end up blurry and out of focus. Like this one. The bunkers in the foreground are also out of focus on this picture. I have read somewhere it is my lens and then I have read other places it a setting in the camera. Can someone help me?