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Positioning your projector16
English
Obtaining a preferred projected image size
The distance from the projector lens to the screen, the zoom setting (if available), and the
video format each factors in the projected image size.
16:9 is the native aspect ratio. W700/W710ST can project a complete 16:9 (widescreen)
ima
ge.
The projector should always be placed horizontally level (like flat on a table), and positioned
dir
ectly perpendicular (90° right-angle square) to the horizontal center of the screen. This
prevents image distortion caused by angled projections (or projecting onto angled surfaces).
The modern digital projector does not project directly forward (like older style reel-to-reel
f
ilm projectors did). Instead, digital projectors are designed to project at a slightly upward
angle above the horizontal plane of the projector. This is so that they can be readily placed
on a table and will project forward and upwards onto a screen positioned so that the bottom
edge of the screen is above the level of the table (and everyone in the room can see the
screen).
If the projector is mounted on a ceiling, it must be mounted upside-down so that it projects
a
t a slightly downward angle.
You can see from the diagram on page 18, that this type of projection causes the bottom edge
of the projected image to be vertically offset from the horizontal plane of the projector.
W
hen ceiling mounted, this refers to the top edge of the projected image.
If the projector is positioned further away from the screen, the projected image size
incr
eases, and the vertical offset also increases proportionately.
When determining the position of the screen and projector, you will need to account for
b
oth the projected image size and the vertical offset dimension, which are directly
proportional to the projection distance.
BenQ has provided a table of screen sizes to assist you in determining the ideal location for
y
our projector. Refer to "W700/W710ST projection dimensions" on page 18. There are two
dimensions to consider, the perpendicular horizontal distance from the center of the screen
(p
rojection distance), and the vertical offset height of the projector from the horizontal edge
of the screen (offset).
16


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