Ultra short throw projector: what is it?

Ultra short throw projectors are an evolution of existing 'short throw' beamers. Whereas regular short throw projectors can project (or 'throw') an image from only a few feet away (as little as three, or as many as eight), ultra short throw cuts down the distance to a matter of inches.
That means they can be placed as close to a wall as you would a television, and is an easy upgrade if your living room is already setup in that manner – though it won't quite sit flush against the wall.
You can choose to project direct onto the wall or onto a dedicated screen, though the former allows the arrangement to take up much less space when not in use – ideal for those who opting for a projector to avoid having a big, black rectangle in their living room at all times.
(Source: Techrader)
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