The Canon A720IS was sent as a replacement for the A520IS I reviewed previously.  I love the camera and am willing to tolerate its few imperfections:  (1) Hanging a single-eyelet camera around your neck means it swings around with every movement;  how much could it have cost to install a second one?  (2) The flash is inadequate for distances greater than 6 feet and there is no way to add an auxiliary flash;  it also seems to be pointed toward the lower half of the picture rather than the center.  (3) It frequently gives the 'low battery' signal when the batteries are fully charged;  opening...