I wanted to get a little more advanced with photography. I know how to use some tools in photoshop but I'm still not clear on all the aspects of the camera. I have a canon powershot s5is, which is kind of in the middle of a basic point and shoot and a dslr. I have acess to a D40 though, so I could learn on that as well. Can anyone recommend some good books on technique (aperture, shutter speed etc, ISO, HDR, etc.) Thanks guys