Letterbox (or 16:9) is the image ratio that gives you black bars above and below the movie. Virtually all major films use this format because letterbox more closely approximates our natural field of vision. In the past most people wanted to watch the full screen versions because large television were too expensive. The benefit of choosing the letterbox is that you gain back the far right and left of the recorded footage, or approximately 33% more of the periphery. With more people owning widescreen televisions or large standard (4:3) televisions appreciation of the 16:9 or letterbox format has become very popular