Obtaining A Preferred Projected Image Size - BenQ LH820ST User Manual

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
• The screen aspect ratio is 16:9 and the projected picture is in a 16:9 aspect ratio
16:9 Screen diagonal
H
W
Vertical Offset (A)*
• *The vertical offset value is the vertical distance from the bottom edge of the image (when the projector is on a
table, diagram on the left), or top edge of the image (when the projector is ceiling mounted, diagram on the right)
to the centerline of lens.
• Due to the lens optical characteristics, every projector has its vertical offset ratio. The vertical offset value
normally gets larger while the projection distance increases.
Screen size
Diagonal
Inch mm
30 762
40 1016
50 1270
60 1524
70 1778
80 2032
90 2286
100 2540
110 2794
120 3048
130 3302
140 3556
150 3810
160 4064
170 4318
180 4572
190 4826
200 5080
210 5334
220 5588
For example, if you are using a 80-inch screen, the recommended projection distance is 876 mm.
Screen
Centerline of lens
Projection distance
H (mm) W (mm)
374 664
498 886
623 1107
747 1328
872 1550
996 1771
1121 1992
1245 2214
1370 2435
1494 2657
1619 2878
1743 3099
1868 3321
1992 3542
2117 3763
2241 3985
2366 4206
2491 4428
2615 4649
2740 4870
Vertical Offset
16:9 Screen diagonal
H
W
Projection distance (mm)
329
438
548
657
767
876
986
1095
1205
1315
1424
1534
1643
1753
1862
1972
2082
2191
2301
2410
(A)
*
Projection distance
Centerline of lens
Screen
*Vertical offset (A)
(mm)
34
45
56
67
78
90
101
112
123
134
146
157
168
179
191
202
213
224
235
247
Positioning your projector 13