Positioning The Projector - InFocus SP4800 User Manual

Positioning the projector

To determine where to position the projector, consider the size and shape of
your screen, the location of your power outlets, and the distance between
the projector and the rest of your equipment. Here are some general guide-
lines:
• Position the projector on a flat surface at a right angle to the screen. The
projector must be at least 4.9 feet (1.49m) from the projection screen.
• Position the projector within 10 feet (3m) of your power source and
within 6 feet (1.8m) of your video device (unless you purchase exten-
sion cables). To ensure adequate cable access, do not place the projector
within 6 inches (.15m) of a wall or other object.
• Position the projector the desired distance from the screen. The distance
from the lens of the projector to the screen, the zoom setting, and the
video format determine the size of the projected image. The top illus-
tration to the right shows three projected image sizes. For more infor-
mation about image sizes at different distances, see "Projected image
size" on page 41.
• The image exits the projector at a given angle. This image offset is
132.9% when the projector is in 16:9 mode (default). This means that if
you have an image 10' high, the bottom of the image will be 3.29' above
the center of the lens.
• The image offset is 112.2% when the projector is in 4:3 mode. This
means that if you have an image 10' high, the bottom of the image will
be 1.22' above the center of the lens.
• See "Connecting a video device" on page 11 for additional information
on 16:9 and 4:3 modes.
10 ft high
image
bottom of image
lens center
3.29 ft above lens
5
19 ft.
7.5 ft.
4.8 ft.
Projection angle in 16:9 mode