I mainly shoot in manual but what exactly is aperture priority mode or how do you use AV mode on my XT. The Aperture is all controlled weird. How does this work and which situations do you use it in? Im not familiar with this. Also, with sports its best to use Ai servo focusing right? but how does that work? I would like to know how to use my camera more than just manual. ANyone familiar with the TV mode? i dont even know what it does. Sometimes i rather not shoot on manual due to constantly changing lighting conditions. Also what are the different types of meting (or is it braceting?) in the camera. There are different symbols for the others which is best what types of scenarios etc. thanks