Samsung LT27A750ND-ZA - Manual (Page 34)

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Zoom1 : Use for moderate magnification. Cuts off the top and sides.
Zoom2 : Use for a stronger magnification.
Wide Fit : Enlarges the aspect ratio of the picture so it fits the entire screen.
N Available with HD 1080i / 720p signals in 16:9 mode.
4:3 : Sets the picture to basic (4:3) mode.
N Do not set your TV to 4:3 format for a long time. The borders displayed
on the left and right, or top and bottom of the screen may cause image
retention (screen burn) which are not covered by the warranty.