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Positioning your projector 15
Obtaining a preferred projected image size
The distance from the projector lens to the screen, the zoom setting, and the video
format each factors in the projected image size.
4:3 is the native aspect ratio of this projector. To be able to project a complete 16:9
(widescreen) aspect ratio image, the projector can resize and scale a widescreen image to
the projector's native aspect width. This will result in a proportionally smaller height
equivalent to 75% of the projector's native aspect height.
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).
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 diagrams 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 4:3-aspect-ratio screen sizes to assist you in determining
the ideal location for your projector. 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).
How to determine the position of the projector for a given
screen size
1. Select your screen size.
2. Refer to the table on page 17 and find the closest match to your screen size in the
left columns labelled "Screen size". Using this value, look across this row to the
right to find the corresponding average distance from screen value in the column
labelled "Average". This is the projection distance.
4:3 aspect image in a 4:3
aspect display area
16:9 aspect image scaled
to a 4:3 aspect display area
Darkened bar
(12.5% height)
Darkened bar
(12.5% height)