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zoom: bigger gives more scope. The video resolution at 1x should be no different from 10, 18 or 24x. That said, according to the manufacturer my car can top 150mph. I can't think of the last time I went above 70 (honest officer).
Do bear in mind that when you go beyond around 5x zoom you will probably need a tripod. (the camera you mention feature an inferior digital image stabiliser, the resolution drops a bit when you activate the image stabiliser).
When you go much beyond 10x you will get colour abberation (also known as fringing, coloured halos, usually red or green, around the subject) on all the cameras you mention.
Zoom lenses are generally bad news, on my stills gear I only have prime lenses, the bigger the zoom the bigger the compromises (pincushion & barrel distortion will occour at both ends of the zoom).
As you zoom in you lose light (this is called f-drop) as the ratio between the size of the iris and the focal length increases. The bigger the zoom, the more light you tend to lose. This means that your picture is visibly darker at the telephoto end than at the wide angle.
As you increase the focal length it becomes a lot harder to focus, as the effective depth of field is reduced massively.
The canon gets the worst rep for motor noise, they all have the zoom lens right above the mic, so there si going to be some pick up on all cameras. One technique is to limit the amount you use the zoom when recording, this will also make your footage look very much more professional (how often do you see massive zooming on tv or in films?, you might see a creeping zoom in a drama, but rarely elsewhere), if you want to change shot sizes, change position and change the focal length, then shoot, this will look a lot better in the edit.
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