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Short projection

A projector with the "short throw" parameter can produce a large image even from a very small distance from the projection surface, such as a wall or screen. Unlike conventional projectors, which require placement at the far end of the room to achieve a large diagonal, short-throw models can make do with distances of tens of centimetres to around one metre. The key indicator here is the so-called projection ratio. This indicates how far the projector is from the screen in relation to the width of the resulting image. While a standard projector may have a ratio of, for example, 1.5:1, meaning that it needs 1.5 metres of distance for a 1 metre wide image, a short throw projector has a much lower ratio, often below 1:1. This solution is particularly practical in smaller rooms such as classrooms or meeting rooms where space is at a premium. The main advantage is that the lecturer or viewer does not cast a shadow on the image as he or she moves in front of the screen, while at the same time not being dazzled by the light from the lens. There are also 'ultra-short-throw' models that are placed directly against the wall and project the image steeply upwards.

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