Changing The Screen Format - Mitsubishi VS-50800 Owner's Manual

The standard format for your WS-65903 or WS-73903 television is a 16:9
aspect ratio. This allows you to watch television broadcasts that are shown in
4:3 aspect ratio and movies that are shown in 16:9 aspect ratio. By using the
FORMAT key, you can change the size of the picture. This allows you to
decide which format you view.
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changing the screen format

Standard picture, NTSC 4:3:
Press the Format key, NTSC EXPAND:
Press the Format key again, NTSC ZOOM:
Any PIP or POP screens will appear in the TV picture area, along with the
main television picture.
Chapter 3: Using the Special Features