I occassionally shoot sports, but until now have never had the occassion of shooting a nighttime football game under lights before. Due to my inexperience and possibly limitations of my equipment, my first attempt shots came out awfullly dark. I am looking for some advice on how to improve the outcome of these nitetime football shootings. I am using a Canon 50D with a EF100-400mm f4.5-5.6 lens. (I know what you may be thinking...you can't shoot nightime football with such a slow lens, you need at least a f2.8...right?). Well there is more... The photos I am shooting are for a website that displays small photos. Therefore, pixel density and noise are not a significant issue. I had shot the game with an ISO of 1600 and did not notice any noise. I have been told I can shoot in the lowest quality setting and with the higest ISO available (3200 or even 12800 (H2 ISO expansion). I was also advised to use Manual Mode with a setting of no less than 1/160 sec. and my widest apeture with the highest ISO available. Should this be adequate, or do you reccomend additional factors to consider?