Hi, I'm fairly new to photography but I am having one issue above all others - shooting groups of people. My issue is that I'm not quite sure what settings to use to achieve the most crisp image throughout. I am using a Canon 5D with the 24-105 IS L lens. It's a great camera and takes amazing photos but again - the photos are only as good as the photographer. Which leads me to the question (finally, right?)....how can I focus on 3, 4 or even more people simultaneously and get crisp images? I can increase aperture to F.8, but will that be enough? Sometimes you will notice under close scrutiny that only some people are in focus. I adjust and move around focus points and even when I switch to manual focus and try to adjust accordingly, it doesn't always work. Any help/suggestions with this issue would be greatly appreciated!