Been a few weeks since my last noob questions...........so obviously its time for more! On the E-pl2, you can select the focus point from the 11 sections, or even more specific with the zoom function. Ive been using the zoom focus mostly, especially when composing my subjects according to the rules of third. Thing is, it takes a good while to move that small green zoom focus box into the right area. So question is, why select focus point when you can just leave the focus point bang in the centre, pre focus, then recompose the shot? This would then work for when your main subject isn't in the centre of the shot. Exposure compensation. What exactly is this? I read a few articles (which I forgot to bookmark) that said that when you adjust the exposure compensation, lets say +1, it will either increase your shutter time or stop down the aperture. Then what difference is this to simply changing the shutter time or aperture?