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2-7
INSTALLATION AND SETUP
Figure 2.4. Screen Locations for Maximum Audience Coverage
2.3 Projector Position and Mounting
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 accom-
modate the required position of the projector for the chosen screen size.
Throw Distance
Throw distance is the distance between the projector’s front feet and the screen. For any installa-
tion, 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 ven-
ues or elevated installations, throw distance still represents the smallest measurement between the
screen and lens.
Throw distance is roughly equal to the hori-
zontal 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 dis-
tance will be approximately 0.8 x the screen
width. Once you know your screen size and
lens, you can estimate throw distance needed
(see example in Figure 2.5).
IMPORTANT: For proper 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.
6 ft.
7.2 ft.
6 x 1.2 = 7.2
1.2:1 lens
Figure 2.5. Estimating Throw Distance
(SEE APPENDIX D)
Screen x Lens Type = Approx. Throw Distance