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Understanding aspect ratio
In the video world, we often hear about aspect ratios. But it seems they are everywhere: there are ratios for lenses, frames and pixels. Are these all the same? The answer is no, but the different ratios you will encounter are highly correlated one between the other. In fact, they all apply to different stages in the process of acquiring digital video.
1. Shooting the video: camera lenses ratios
When you first acquire footage through your camera, you usually have a lens mounted on it…(!) Most people will have a regular 4:3 lens, which means than an image captured by it will have a length 1.33 times its height. Now as you probably know, it is also possible to shoot video in widescreen format, like what you see in theatres, which often implies the use of different lenses. To sort out all these possibilities, let's use the following example. You are on vacation in Copenhagen, and you have an NTSC DV camera that has a 16:9 ("widescreen") option. You are in front of the following scene and you would like to shoot it for a few seconds.
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