Matty Blast

Chosen answer: A frame of film is square, rather than rectangular, so there are two options to get a widescreen picture. If an anamorphic lens is used, then the entire frame is used to capture a slightly horizontally squashed image, then in projection the entire frame is stretched out into widescreen. The other route taken is to block off the top and bottom of the frame, resulting in the correct rectangular shape. In projection a metal plate is used to only display this rectangular area. Because only the central region is meant to be shown, filmmakers will very often put boom mikes or other things just outside of that area - after all, otherwise a microphone will have to be further away from the actors just to avoid an unused area of film anyway. However, if a fullscreen (4:3 ratio) version is created by including these top and bottom sections rather than cropping the sides (possibly because both edges of the screen have to be seen in that shot, otherwise something important will be cropped), some things will be seen which were never meant to be. A good example is seen in the fullscreen version of "The Matrix" - when Neo receives the mobile phone near the start, you can see a crew member's hand in shot at the bottom of the screen. This is also the reason some people think a boom mike is accidentally in shot for the entirety of a movie when they see it in a theatre. If the projectionist hasn't positioned the metal plate properly, the bottom of the correct area is cut off, and too much of the top is shown, frequently exposing the microphone. So ultimately the top and bottom can only be used when they don't contain film-making equipment, and even then the framing of the shot may look odd, as the film was never shot with those parts of the screen in mind.

Jon Sandys ★