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No. The 3DS uses glasses-free 3D technology only in use by Nintendo, Panasonic, and Toshiba so far.
Yes. Toshiba makes models that are autostereoscopic (glasses-free) however these models are very very expensive.
No, you will not need 3D glasses for the Nintendo 3 DS
Toshiba has already launched glasses free 3D TV. But it has its limitations that only 11 people can watch 3D at a time and it is not as effective as other present 3D TVs
For the 3DS, the 3D feature does not require 3D glasses to play so you do not need to buy 3D glasses.
Take a look at Sony, Samsung, Panasonic, Sharp or Toshiba. All offer Internet, and comfortable glasses. Toshiba even offer 3D television without glasses but at a stunning price at the moment. If you can't afford the premium brands, LG offer passive 3D and they are cheaper than the top names.
The first brand to release the 3D TV that you could watch without the need of glasses is Toshiba. Although it was the first in it's class to do so, the TV was only 20 inches wide.
Currently, all commercial 3D televisions require glasses. There are some concept models that do not require glasses but they are not in full production and are not considered to be market ready at present. The future of 3D will be heading towards viewing without glasses but there is a way to go before we will see the televisions in the stores.
The new movie Step Up 3 has two versions, a regular one and a 3D one. To watch the 3D version, you need the 3D glasses. If you're watch the regular non-3D version, you don't need the glasses.
LG cinema 3D glasses have no batteries, they do not need recharging :).
You don't need any! Just slide the 3D depth slider on the top screen and you get glasses free 3D!
Currently, all 3D televisions need glasses but the latest one are now only a few grams in weight. Active glasses are almost as light as passive glasses so there is no need to put up with the reduced resolution of LG passive 3D just to get light glasses.