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It is often argued that 21:9 is to remove the black bars on whide-format movies - which is rather subjective of nature, and very visual.

There is in fact another view, which is more quantitative and "scientific". On a 16:9 screen to watch the movie in the same size, whide-format movies are down-scalled, or rather the source is down-scalled and black bars are inserted. Meaning the optimal sitting distance changes when you change movie-format. You have to move closer when watching a down-scaled movie ( when watching Cinemascope material ).

If you consider a 50" 21:9, it is often argued why not get a 60" 16:9 instead - well, apart form the problem of space, there is the old problem of optimal viewing distance - on the 60" 16:9 content will be blown up to a huge format, giving less picture quality and you have to move further back to get an optimal viewing distance each time you change format.

On a 21:9 TV set, there is no up- or down-scalling of either 21:9 or 19:9 contents, the viewing distance is the same on both formats. Then you of cause instead have the black bars at the sides - but on the positive side you can streach the 16:9 content if you like - you have the option.

So its about angle of view ;-)