I am new to DSLR, most of time i shoot with A(v) and S mode, i found these two modes meet most of my need. now starting to explore mamual mode, would like to learn more from expert here. what is the advantage of using mamual mode than Av or S mode? in Av or S mode, i just need to decide the aperture or shutter speed, then camera will do the other job to give a appropiate exposure, in mamual mode how do i know the combination? i just want to know how to get start with mamual mode.