Samsung PN59D6500DFXZA - Manual (Page 173)

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English
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● Be sure to stay within the viewing angle and optimum TV viewing distance
when watching 3D pictures. Otherwise, you may not be able to see 3D
effects properly.
● The ideal 3D viewing distance is three times or more the height of the
screen. For example, if your screen is two feet high, you should sit at least
six feet from the screen. We recommend sitting so that your eyes are level
with the screen.