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This is called vignetting. It is most often seen when there is a fault or design fault in the optical path of lens system. On cameras, it could be caused by a bad flash, bad lense design, shutter problems.
The effect is often used in contrent as a dramatic or stylistic element . If you are seeing this on full screen images where you know it is not designed into the content, then there is a serious problem with your set.






















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