I have a rebel xti with a f 2.8 70-200mm IS lense. I just got this lense so am trying to figure it out. I get great photos until dark. I can take pictures during the entire game but the color is off. I have been using ISO 1600 and shoot using the TV (shutter priority mode). I am looking for suggestions on how I can take better night shots without having to do alot of adjusting in photoshop.