Projection Devices, ContinuedProjectorMake sure the projector is securely supported so that it will not fall or jigglesupportduring the presentation.The projector should project the image over theheads of the audience without partially projecting it onto the ceiling or floor.Position the projector close enough to the screen to permit even illumination.Make sure the lens projects the image at a 90-degree angle to the projectionsurface to prevent keystoning, covered later in this chapter.Figure 5-1 shows the correct positioning of a projector to prevent keystoning.Figure 5-1. —Correct projector angles.Continued on next page5-4
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