Hi everyone, Some elementary questions here. I did some web search myself, but am still not 100% sure, so I ask: 1. aperture priority AE or shutter priority AE What do they mean, practically speaking, and what considerations are there in making a choice between them? 2. playback or record mode Similar question as #1. 3. Is it always desirable to set up a maximum highest shutter speed that the camera can afford? And, (I'm ashamed), how to change shutter speed manually? 4. In my camera, there's an option of "backlight on/off", what function this one serves? If you know an answer to any of these questions, please do respond. Thanks!