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Positioning your projector18
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 19 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 distance from screen value in the column labelled
"Distance from screen (mm)". This is the projection distance.
3. On that same row, look across to the right column and make note of the "Vertical
offset (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 the MP780 ST+ and a 120-inch screen, the projection
distance is 1293 mm and with a vertical offset of 264 mm.
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 on page 19 and find the closest match to your measurement in the
column labelled "Distance from screen (mm)".
3. Using this value, look across that row to the left to find the corresponding "Screen
size" 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 "Vertical
offset (mm)" value. This will determine the final placement of the screen in relation
to the horizontal plane of the projector.
For example, if you are using the MP780 ST+ and your measured projection distance is 2.0
m (2000 mm), the closest match in the column is 1616 mm. Looking across this row shows
that a 150-inch screen is required.
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 33 on page for details.