Visual Systems Division
Technical Bulletin
LT85 Throw Distance Data
Desktop and Ceiling Mount
Rev. 1.6
Page 3
Projection Distance and Screen Size for Ceiling Mount Installation
The following diagram shows the relationship between projector position and the screen.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mount Installation
α
C
B
D
Lens Ctr
Screen Top
Screen Ctr
Throw Distance
LT
150
2.96
Lens Offset from
Ctr of Projector
Distance Chart
Note:
For screen sizes of 36 to 200 inches not indicated on the projection tables, use the formulas on page 1.
Screen Size
B
C
D
α
Diagonal
Width (H)
Height (E)
40"
32"
24"
16.7"
54.7"
4.7"
17.0°
60"
48"
36"
25.1"
81.9"
7.1"
17.0°
67"
53.6"
40.2"
28.0"
90.8"
7.9"
17.1°
72"
57.6"
43.2"
30.1"
97.6"
8.5"
17.1°
84"
67.2"
50.4"
35.1"
113.8"
9.9"
17.1°
90"
72"
54"
37.6"
122.0"
10.6"
17.1°
100"
80"
60"
41.8"
135.8"
11.8"
17.1°
120"
96"
72"
50.2"
162.6"
14.2"
17.1°
150"
120"
90"
62.8"
203.5"
17.8"
17.1°
180"
144"
108"
75.3"
244.1"
21.3"
17.1°
