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Positioning your projector 15
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 and find the closest match to your screen size in the left columns
labelled "4:3 Screen Diagonal". Using this value, look across this row to the right to
find the corresponding average distance from screen value in the column labelled
"Recommended projection distance from screen in mm". This is the projection
distance.
3. On that same row, look across to the right column and make note of the vertical offset
value. This will determine the final vertical offset placement of the projector in
relation to the edge of the screen.
4. The recommended position for the projector is aligned perpendicular to the
horizontal center of the screen, at the distance from the screen determined in step 2
above, and offset by the value determined in step 3 above.
For example, if you are using a 120 inch screen, the recommended projection distance is
4800 mm and with a vertical offset of 183 mm.
If you place the projector in a different position (to that recommended), you will have to tilt
it down or up to center the picture on the screen. In these situations, some picture distortion
will occur. Use the Keystone function to correct the distortion. See "Correcting keystone" on
page 25 for details.
How to determine the recommended screen size for a
given distance
This method can be used for situations where you have purchased this projector and would
like to know what screen size will fit in your room.
The maximum screen size is limited by the physical space available in your room.
1. Measure the distance between the projector and where you want to position the
screen. This is the projection distance.
2. Refer to the table and find the closest match to your measurement in the column
labelled "Recommended projection distance from screen in mm".
3. Using this value, look across that row to the left to find the corresponding screen
diagonal listed in that row. That is the projected picture size of the projector at that
projection distance.
4. On that same row, look across to the right column and make note of the vertical Offset
value. This will determine the final placement of the screen in relation to the
horizontal plane of the projector.
For example, if your measured projection distance was 4.5 m (4500mm), the closest match
in the "Recommended projection distance from screen in mm" column is 4320 mm.
Looking across this row shows that a 9' (108'') screen is required. If you can only obtain a
metric sized screen, the screen size is 2743 mm diagonally.