My first post on this forum and I am excited to find a Alpha user group. So here is my problem, my girlfriend got season tickets to the Chargers here in San Diego. Took my new A300 with the 75-300 lens to the game to take some pictures. All I can say is that I love this thing!!! Haha. The pictures my camera took were amazing, that is untill it got dark outside. Everything from about the second quarter on was never in focus, they all looked just really soft and blurry. See the picture below.
Here is my metadata:
Aperture 5.6
Shutter 1/60
ISO 800.

Now, my thinking is that due to my small apterture is causing a very narrow depth of field and that is what's causing my soft pictures. Any ideas?