Samsung PN51F5300AFXZA - Manual (Page 113)

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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 is three times or more the height of the screen. We
recommend sitting with your eyes level with the screen.
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If you can not play 3D videos on your Blu-ray player, take out the disk and
then put it in again, or restart the Blu-ray player.
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