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Sticky... add to that it has to do with the camera's pixel aspect ratio. A camera may shoot in 1440x1080, but it can render at 1920x1080 in a video editor because it's pixels are not square, but rather rectangular. I know the Canon A1 captures at 1440x1080.
When I shot with a Panasonic HVX200 a few months ago, it's actual capture is 1280x1080, which is really kind of fucked up, right? Additionally, it achieves this feat on 3 offset 960x540 chips (or at least that's what all the reading I found says.... Panasonic never really gives the specs out that I could find). But, when all is said and done and I bring it in to FCP and render it, it's true 16:9 at 1920x1080. Confused the hell out of me and I had to do more reading to understand the whole rectangular pixel thing.
HD is defined as video delivered at 720P or 1080 (interlaced or progressive). Most people assume that HD automatically means 1080.
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