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Installation type, screen type, and lighting all affect where the projector is positioned.
In addition, both throw distance (the distance between the projector and screen) and
vertical position (the height of the projector in relation to the screen) must be
determined for every new installation. Both depend on the screen size and lens type
you are using. Make sure that the room can accommodate the required position of the
projector for the chosen screen size.
Throw distance is the distance between the projector's front feet and the screen. For
any installation, an accurate throw distance must be determined in order for the
image to be of the right size for your screen–the farther the projector is from the
screen, the larger the image.
NOTE: If your projector is tilted in relation to the screen, as is sometimes the case
for large venues or elevated installations, throw distance still represents the smallest
measurement between the screen and front feet.
Throw distance is roughly equal
to the horizontal width of the
screen multiplied by the type of
lens you are using. For example,
if you are using a 0.8:1 lens,
proper throw distance will be
approximately 0.8
width. Once you know your
screen size and lens, you can
estimate throw distance needed
(see example in Figure 2.8).
,03257$17
placement in an installation,
always refer to the throw distance formula and/or graph for your lens as listed in
Appendix E. Keep in mind that due to lens manufacturing tolerances for lens focal
length, actual throw distance can vary ±5% between lenses described as having the
same throw ratio.
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