14
Positioning your projector
How to determine the position of the projector for a given screen size
1.
Determine the aspect ratio of your screen, (16:9 or 4:3)? If you have a 16:9 screen, refer to
"Installation for a
16:9 ratio screen" on page 15
. If you have a 4:3 screen, refer to
"Installation for a 4:3 ratio screen" on page
16
.
2.
Select your screen size.
3.
Refer to the table and find the closest match to your screen size in the left columns labelled '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 'Average'. This is the 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 vertical offset placement of the projector in relation to the edge of the screen.
5.
The recommended position for the projector is aligned perpendicular to the horizontal centre 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 with 16:9 aspect ratio, the average projection distance is 4829 mm
and with a vertical offset of 244 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 image on the screen. In these situations, some image distortion will occur. Use the Keystone function
to correct the distortion. See
"Correcting keystone" on page 25
for keystone correction.
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.
Determine the aspect ratio of your screen, (16:9 or 4:3)? If you have a 16:9 screen, refer to
"Installation for a
16:9 ratio screen" on page 15
. If you have a 4:3 screen, refer to
"Installation for a 4:3 ratio screen" on page
16
.
2.
Measure the distance between the projector and where you want to position the screen. This is the
projection distance.
3.
Refer to the table and find the closest match to your measurement in the average distance from screen
column labelled 'Average'. Check that your measured distance is between the min and max distances listed
on either side of the average distance value.
4.
Using this value, look across that row to the left to find the corresponding screen diagonal listed in that row.
That is the projected image size of the projector at that projection distance.
5.
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 you have a 4:3 aspect screen and your measured projection distance was 4.8m (4800mm), the
closest match in the Average column is 4851mm. Looking across this row shows that a 2500mm (2.5m) screen is
required. If you can only obtain imperial sized screens, the listed screen sizes on either side of the 2.5m screen are
the 8' and 9' screens.
Checking the min. and max. projection distance values for these screen sizes, indicates that the 4.8m measured
projection distance will fit the 2.5m and 8' screens. The projector can be adjusted (using the zoom control) to
display on these different screen sizes at that projection distance. Be aware that these different screens have
different vertical offset values.
