the HF S100 continues Canon's tradition of producing not particularly sturdy-seeming products. Once again, a Canon camcorder greets us with that familiar rattling of internal parts that's a bit unsettling on the ears. When you're in photo or video mode, the rattling subsides, but in playback mode or when the camcorder is powered down, the rattling is very distinct. We thought at first that this was the lens cover, but the sound comes from further up the barrel and it occurs even when we hold the lens cover in place. Whatever the sound is, it's not something you like to hear from a thousand-dollar piece of equipment.