Electrohome VistaGraphX 5000, User Manual, Page: 11 / 116

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Throw distance is roughly equal to the horizontal width of the screen multiplied
by the type of lens you are using (for example, if using a 3.9:1 lens, throw
distance should be approximately 3.9
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the screen width). Once you know your
screen size, you can closely estimate how far away the projector should be, as
shown in Table 2-1. Always refer to Appendix E for permanent installations.
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NOTES: 1) While throw distance is measured perpendicular to the screen and
projector, this measurement is not necessarily parallel to the floor—both
projector and screen may be inclined together. 2) It is good practice to simulate
the setup with the projector fully warmed-up to determine the actual throw
distance required. 3) Always refer to Appendix E for permanent installations.
The vertical position of the projector in relation to the screen also depends on the
size of the screen and the lens type. Correct vertical position helps ensure that
the image will be rectangular in shape rather than keystoned (having non-parallel
sides) and that image quality remains at its best.
Vertical position can be manually offset—that is, the image can be moved up—
using the vertical adjustment knob on the front of the projector. The range of
adjustment depends on the lens type you are using (Table 2-2). In addition, refer
to Figure 2-6 to see more clearly how the pixel offset ranges affect the placement
of your image in relation to the vertical location of the projector.
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