timmartin-harvey. When you're shooting normally, most resolutions need to be stretched to fit into a normal aspect ratio. It will say at the bottom of the resolution menu, stretch at 1.6 to go into 16:9, for example. So what I do, in Vegas Studio, probably the same for other NLEs, is in "pan/crop" I select 'no' for keep aspect ratio, in that way, it will fill to the aspect of my editor settings, usually 16:9.
However, you can shoot in "crop mode" at 1280x720 that will give you true 16:9 aspect. The reason you didn't get that is you were shooting in normal mode. I don't have your camera, but you want to select crop mode before you shoot. Crop mode is not desirable, usually, because it increases you effective focal length, depending on camera 3x or 5x. The good thing is that, because it shoots the center of the sensor, without line skipping, you get virtually no moire.
Put another way, shoot almost any mode in normal mood and risk getting moire. Shoot in crop mode and get no moire, but higher focal lengths.
