Sim2 Crystal - Manual (Page 12)

12 Positioning your projector
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.
The projector should always be placed horizontally level (like flat on a table), and
positioned directly perpendicular 90° right-angle square) to 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.
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 positions 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.
This projector is equipped with a movable lens. See "Shifting the projection lens" on
page 16 for details. You can see the diagrams on pages 14 and 15 for the vertical offset
values in the dimension tables that are measured when the lens is shifted fully up or
down.
How to determine the position of the projector for a given
screen size
1. Determine the aspect ratio of your screen.
2. Refer to the table and find the closest match to your screen size in the left columns
labelled "Screen dimensions" . 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.
3. Decide the exact position of your projector according to the position of your screen
and the adjustable lens shift range.
For example, if you are using a 120-inch, 4:3-aspect-ratio screen, please refer to "The
screen aspect ratio is 4:3 and the projected picture is 16:9" . The average projection
distance is 668 cm.
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.
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.