Hi, The Epson Duet 80" Portable Projector Screen is resizable in fine increments from 79 1/2" diagonal to fully closed. You can adjust the width by pulling the sides out, or pushing them closer together. At full width, it is 79 1/2" diagonal at a 16:9 aspect ratio. If you push the sides together to a 4:3 aspect ratio, the size is 61 3/4" diagonal. Regards, Mark - The Epson Team.