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Positioning your projector 15
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. SP840 can project a complete 16:9 (widescreen) image.
The projector should always be placed horizontally level (like flat on a table), and
positioned directly 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
film 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
at a slightly downward angle.
You can see from the diagram on page 17, that this type of projection causes the bottom
edge of the projected image to be vertically offset from the horizontal plane of the projector.
When 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
increases, and the vertical offset also increases proportionately.
When determining the position of the screen and projector, you will need to account for
both 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
your projector. Refer to "SP840 projection dimensions" on page 17 depending on the
projector you are using. There are two dimensions to consider, the perpendicular horizontal
distance from the center of the screen (projection distance), and the vertical offset height of
the projector from the horizontal edge of the screen (offset)
4:3 aspect image in a 16:9
aspect display area
16:9 aspect image scaled to a 4:3 aspect
display area