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For other uses of the term "throw", see throwing.
In film terminology, throw is the distance of a movie projector from the screen. It is the distance the image is thrown onto the screen, and it has a large effect on screen size.[1] Often in home theatre individuals lack the correct throw distance in the room, but can buy a short throw lens, there are also "long throw" lenses available.
A related term, throw ratio, refers to the ratio of the distance to the screen (throw) to the screen width. A larger throw ratio corresponds to a more tightly focused optical system.
Throw Ratio = D / W 
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