Samsung UN55EH6070F E-Manual page 139

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The 3D Active Glasses may not work properly if there is any other 3D
product or electronic devices turned on near the glasses or TV. If there is
a problem, keep other electronic devices as far away as possible from the
3D Active Glasses.
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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 enjoy
proper 3D effects.
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The ideal viewing distance should be three times or more the height of
the screen. We recommend sitting with viewer's eyes on a level with the
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screen.
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If you can not play 3D videos in some of the BD players, take out the disk
from player and put it again, or restart the BD player.
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