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Throw distance

Discussion in 'Wiki' started by derekleffew, Apr 28, 2009.

  1. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Las Vegas, NV, USA
    The length of an imaginary line from the projector (or luminaire) to the screen (or object being lighted).

    Stage lighting: When calculating photometric information, the hypotenuse of a right triangle where one leg is the vertical distance above the object (V) and the other leg is the horizontal distance to the object (H).
    Throw Distance = √(V^2 + H^2).

    Projection: One usually wants the projector's lens to be centered on both the horizontal and vertical axes of the screen; so Throw Distance=Distance from Projector to Screen.

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