13 Positioning your projector
Obtaining a preferred projected image size
The distance from the projector lens to the screen, the zoom setting (if available), and the video format
each factors in the projected image size.
Projection dimensions
MX808ST/MX825ST
• The screen aspect ratio is 4:3 and the projected picture is in a 4:3 aspect ratio
For example, if you are using a 120-inch screen, the recommended projection distance is 1477 mm.
If your measured projection distance is 1000 mm, the closest match in the "Distance from screen (mm)"
column is 985 mm. Looking across this row shows that a 80'' (about 2.0 m) screen is required.
Screen size
Distance from screen
(mm)
Lowest/
Highest Lens
position (mm)
Diagonal
H (mm) W (mm)
Inch mm
60 1524 914 1219 738 137
70 1778 1067 1422
862 160
80 2032 1219 1626
985 183
90 2286 1372 1829
1108 206
100 2540 1524 2032
1231 229
110 2794 1676 2235
1354 251
120 3048 1829 2438 1477 274
All measurements are approximate and may vary from the actual sizes.
BenQ recommends that if you intend to permanently install the projector, you should physically test the projection
size and distance using the actual projector in situ before you permanently install it, so as to make allowance for this
projector's optical characteristics. This will help you determine the exact mounting position so that it best suits your
installation location.
H
W
Projection distance
Center of lens
Screen
4:3 Screen diagonal
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