Most modern cameras offer different image sizes in-camera, though all they really do is crop the top and bottom or sides. There are a few digital cameras that have sensors bigger than the lens’ image circle, which allow the diagonal angle of view for a given focal length to be maintained when changing crop; the main one of these is the Panasonic LX series of cameras. Put one of these on a tripod, slide the aspect ratio switch on the lens barrel and you’ll notice that the horizontal field of view gets wider than the 4:3 option, even though this is the native aspect ratio of the sensor. (It also means that you don’t suffer as much of a resolution decrease as you’d expect when changing aspect ratios). There is no point in shooting in another aspect ratio if all the camera does is throw away the extra pixels; you’re better off capturing as much information as you can at the time of shooting and then deciding later what crop would work best (assuming, of course, that you didn’t compose correctly at the time.)
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