So I was in Fla for memorial day. I had my 20D with a Canon 24-70mm. I was using it to take pics of the kids and family and the beach and in the ocean. These were all taken throught the day and the sun was nice and bright. I used the lens shroud but the pics were still all over exposed. Fixed many in Aperture the best I could but would like to know what I can do in the future to help. UV Filter? Other?