Does anyone know the answer to this technical question: In cameras that have movie mode (like the Canon SD series), the movies are only 640X480. Does that mean they are only using 640 pixels by 480 pixels from the CCD to capture the movie image, or do they use the whole CCD chip and downscale it in the camera to 640X480. Also, on a related topic, given that a movie might be 30 frames per second, is the shutter speed for each frame that slow (1/30), or is the shutter speed possibly higher (say 1/60 or even 1/250), but its only take 30 each second. I now these are not run of the mill questions, but I am not sure where to go with these. I can't quite seem to find an answer on various forums and website. Thanks in advance if anyone knows the answers. Also, if anyone knows of a good Q&A site that might be able to answer such a question, that'd be really helpful.