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Positioning your projector 17
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SP840 projection dimensions
Refer to "Dimensions" on page 64 for the center of lens dimensions of this projector before
calculating the appropriate position.
There is 5% tolerance among these numbers due to optical component variations. BenQ
recommends that if you intend to permanently install the projector, you should physically test
the projection size and distance using the actual projector 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.
16:9 screen
Recommended projection dis-
tance from screen in mm
Vertical
offset in
mm
diagonal Width
Height
Min
length
(with max.
zoom)
Average
Max
length
(with min
zoom)
Inches mm mm mm
30 762 664 374 1056 1162 1267 112
40 1016 886 498 1408 1549 1690 149
50 1270 1107 623 1760 1936 2112 187
60 1524 1328 747 2112 2323 2534 224
80 2032 1771 996 2816 3098 3379 299
100 2540 2214 1245 3520 3872 4224 374
120 3048 2657 1494 4224 4646 5069 448
150 3810 3321 1868 5280 5808 6336 560
200 5080 4428 2491 7040 7744 8448 747
220 5588 4870 2740 7744 8518 9293 822
250 6350 5535 3113 8800 9680 10560 934
300 7620 6641 3736 10560 - - 1121
Projection distance
Center of lens
Screen
Vertical offset
Maximum zoom
Minimum zoom