BenQ W700 User Manual page 17

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 "16:9
corresponding average distance from screen value in the column labelled "Average".
This is the projection distance.
3. On that same row, look across to the right column and make note of the
in mm" 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 W700 average projection distance is 4325 mm and with a vertical offset of 269 mm.
the W710ST average projection distance is 2004 mm and with a vertical offset of 269 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
page 33 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 average
distance from screen column labelled "Average". If the min and max values are
available on the table, check that your measured distance is between the min and max
distances listed on either side of the average distance value.
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 image size of the projector at that
projection distance.
4. On that same row, look across to the right column and make note of the
in mm" value. This will determine the final placement of the screen in relation to the
horizontal plane of the projector.
For example,
W700: if your measured projection distance was 3.5 m (3500 mm), the closest match
in the "Average"
100-inch screen is required.
W710ST: if your measured projection distance was 1.5 m (1500 mm), the closest
match in the
that a 100-inch screen is required.
screen". Using this value, look across this row to the right to find the
column is 3604 mm. Looking across this row shows that a 
"Average" column is 1670 mm. Looking across this row show
"Vertical offset
"Correcting keystone" on
"Vertical offset
Positioning your projector 17