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NEC Display Solutions of America, Inc.
VT491/590/595 Installation Guide
Ceiling Mounted and Desktop Rev 1.3
www.necdisplay.com VT491/590/595 Page 2 of 6
Diagrams and Distance Charts
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of
installation.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mounted
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Top
5.26"
5.68"
Lens Offset From
Mount Pipe
3.27"
D
Desktop
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Bottom
2.57"
D
Distance Chart for popular 4:3 screens
Screen Size (4:3)
Diag W H
inches inches inches inches inches
30 24 18 6 -3
60 48 36 13 -5
72 57.6 43.2 15 -6
84 67.2 50.4 18 -7
90 72 54 19 -8
100 80 60 21 -9
120 96 72 26 -10
150 120 90 32 -13
180 144 108 38 -16
200 160 120 43 -17
250 200 150 53 -22
300 240 180 64 -26
B
C
wide - tele
D
α
wide - tele
inches degrees
35 - 43 10.2 - 8.5
72 - 87 10.1 - 8.4
87 - 104 10.0 - 8.4
101 - 122 10.0 - 8.4
109 - 130 10.0 - 8.4
121 - 145 10.0 - 8.3
145 - 174 10.0 - 8.3
182 - 218 10.0 - 8.3
218 - 262 10.0 - 8.3
365 - 438 9.9 - 8.3
243 - 291 10.0 - 8.3
304 - 364 9.9 - 8.3
Note: For screen sizes not indicated on the projection
tables, use the formulas on page 1.