NEC Display Solutions of America, Inc.
PX700W/PX750U/PX800X Installation Guide
Desktop and Ceiling Mount
Rev 1.0
www.necdisplay.com
PX700W/PX750U/PX800X
Page 4 of 12
Formulas:
4:10
Aspect
Ratio (PX800X—XGA)
The Projection Formulas use the image width for calculation. Image width is the same for all aspect ratios, only vertical image size
varies. For proper projector placement, determine the image width for a desired screen size. Use the Screen Formulas below to
calculate all screen dimensions. Plug in the image width for “W” in the Projection Formulas.
Refer to the diagrams and charts for popular screen sizes on page 2 and 3:
Projection Formulas:
Definitions:
4:3 Screen Formulas
NP16FL: C
=
0.822W
–
1.866
W
=
Image
Width
W
=
H
x
4/3
NP17ZL: C
(Wide) = 1.358W – 2.094 ------
C
(Tele) = 1.934W – 1.913
H = Image Height (size) H = W x 3/4
NP18ZL: C
(Wide) = 1.828W – 2.681 ------
C
(Tele) = 2.397W – 2.642
C = Throw distance
Screen Diagonal = W x 5/4
NP19ZL: C
(Wide) = 2.343W – 3.154 ------
C
(Tele) = 3.883W – 3.118
NP20ZL: C
(Wide) = 3.789W – 5.323 ------
C
(Tele) = 5.689W – 5.299
NP21ZL: C
(Wide) = 5.664W – 11.638 ------
C
(Tele)
=
8.834W
–
11.535
Distance
Chart
for
popular
4:3
Screens
(XGA)
Rear Lens
NP16FL
Diagonal Width(W) Height (H)
0.76:1
inches
inches
inches
inches
40
32
24
24.4
41.4 - 60.0
55.8 - 74.1
68.6
121.1
115.9
176.7
222.6
271.2
60
48
36
37.6
63.1 - 90.9
85.1 - 112.4
104.5 - 183.3
176.5
267.8
345.7
412.5
67
54
40.2
42.2
70.7 - 101.7
95.3 - 125.8
117.1 - 205.0
197.8
299.6
388.8
462.0
72
58
43.2
45.5
76.1 - 109.5
102.6 - 135.4
126.0 - 220.5
212.9
322.4
419.5
497.3
84
67
50.4
53.4
89.2 - 128.1
120.2 - 158.4
147.6 - 257.8
249.3 - 377.0
493.4 - 582.1
90
72
54
57.3
95.7 - 137.3
128.9 - 169.9
158.3 - 276.5
267.5 - 404.3
530.3 - 624.5
100
80
60
63.9
106.5 - 152.8
143.6 - 189.1
176.3 - 307.5
297.8 - 449.8
591.8 - 695.2
120
96
72
77.0
128.3 - 183.8
172.8 - 227.5
212.2 - 369.7
358.4 - 540.8
714.9 - 836.5
150
120
90
96.8
160.9 - 230.2
216.7 - 285.0
266.0 - 462.8
449.4 - 677.4
899.5 - 1048.5
180
144
108
116.5
193.5 - 276.6
260.6 - 342.5
319.8 - 556.0
540.3 - 813.9
1084.1 - 1260.6
210
168
126
136.2
226.1 - 323.0
304.4 - 400.1
373.7 - 649.2
631.2 - 950.5
1268.7 - 1472.6
240
192
144
156.0
258.6 - 369.4
348.3 - 457.6
427.5 - 742.4
722.2 - 1087.0 1453.3 - 1684.6
NP21ZL
5.30-8.30:1
inches
Zoom Lenses
inches
inches
1.29-1.79:1
1.73-2.27-1
inches
inches
Screen Size (16:10)
3.60-5.40:1
NP17ZL
NP18ZL
NP19ZL
NP20ZL
2.22-3.67:1
