Please understand that I am relatively new to photography and my question may seem somewhat vague. I own a D300 and was taking outdoor photo's of my wife and son the other day. I set the camera to aperture priority, 200 ISO and White Balance of direct sunlight. I took apicture about 15 feet from the subject and the results were somewhat out of focus. Upon review the camera setting indicated a shutter speed of 1/15 sec at f16. My other photos that were clear indicated a shutter speed of 1/30 sec. This was a rather sentimental photo and I am disapointed with the results. What am I doing wrong and what should I do in the future to prevent this from happening again?