2. Installation
BenQ HT 480W User’s Guide
10
Ceiling Installation
Distance: Projection
distance
(the distance between the projection lens and the screen).
Height: The
vertical
height of the screen center.
Roof:
The height of the roof.
Offset:
The difference in height between the center of the projection lens and the center of the projected image.
(The projector should be installed horizontally. )
1.
Choose the screen width you desired from the chart below, installing the projector at a distance from the screen
between the corresponding Minimum and Maximum Distance. (Minimum Distance = 1.61 x Screen Width,
Maximum Distance = 2.04 x Screen Width)
2.
Fine tune the projected image size using the zoom and focus rings on the projection lens.
3.
Decide on the exact height you desire for the center of the screen's Height.
4.
Mount this unit using ceiling mounting rack with a suitable length (Roof - Height - Offset) to meet your
requirements, and avoid any keystone distortion.
5.
Alternatively, use the adjusters to fine tune the projection angle to meet your requirements, and then use the
keystone correction function to correct any distortion.
16 : 9 (480P mode) (inch)
4 : 3 (Full-screen mode) (inch)
Distance
Roof - Height - Offst
Center of the lens
Center of the screen
Screen Width
40
60
80
90
100
110
120
140
160
180
200
Distance
Minimum
66
98
131
148
164
180
197
230
262
295
328
Maximum
85
128
170
192
213
234
256
298
341
383
426
Offset
20
30
39
44
49
54
59
69
79
89
98
Screen Width
40
60
80
90
100
110
120
140
160
180
200
Distance
Minimum
66
98
131
148
164
180
197
230
262
295
328
Maximum
85
128
170
192
213
234
256
298
341
383
426
Offset
18
28
37
42
46
51
55
65
74
83
92
Roof
Height
Offet
Content-e.fm Page 10 Monday, July 8, 2002 4:23 PM
