NEC GT2000 - Manual (Page 20)

E-20
Standard Zoom Lens (Wide)
α
β (sin= α )
γ (cos= α )
Screen Size
H–Width
4 : 3 Diagonal
A
C
D
E
Degree
inch
mm
inch
mm
mm
inch
mm
inch
mm
inch
mm
inch
9.0
0.16
0.99
32
812.8
40
1016
1557
61.3
1537
60.5
-32
-1.2
336
13.2
8.9
0.15
0.99
48
1219.2
60
1524
2377
93.6
2349
92.5
-1
-0.0
458
18.0
8.8
0.15
0.99
56
1422.4
70
1778
2787
109.7
2754
108.4
14
0.6
519
20.4
8.8
0.15
0.99
64
1625.6
80
2032
3197
125.9
3160
124.4
29
1.1
580
22.9
8.8
0.15
0.99
72
1828.8
90
2286
3608
142.0
3566
140.4
44
1.7
641
25.3
8.7
0.15
0.99
80
2032
100
2540
4018
158.2
3971
156.4
60
2.3
702
27.7
8.7
0.15
0.99
96
2438.4
120
3048
4838
190.5
4783
188.3
90
3.5
825
32.5
8.7
0.15
0.99
120
3048
150
3810
6069
238.9
6000
236.2
135
5.3
1008
39.7
8.7
0.15
0.99
144
3657.6
180
4572
7300
287.4
7217
284.1
181
7.1
1191
46.9
8.6
0.15
0.99
160
4064
200
5080
8120
319.7
8028
316.1
211
8.3
1313
51.7
8.6
0.15
0.99
192
4876.8
240
6096
9761
384.3
9651
380.0
272
10.7
1557
61.3
8.6
0.15
0.99
216
5486.4
270
6858
10992
432.76
10868
427.9
317
12.5
1740
68.5
Standard Zoom Lens (Tele)
8.6
0.15
0.99
240
6096
300
7620
12223
481.2
12085
475.8
363
14.3
1923
75.7
α
β (sin= α )
γ (cos= α )
Screen Size
H–Width
4 : 3 Diagonal
A
C
D
E
Degree
inch
mm
inch
mm
mm
inch
mm
inch
mm
inch
mm
inch
7.0
0.12
0.99
32
812.8
40
1016
2013
79.3
1999
78.7
-32
-1.2
336
13.2
6.8
0.12
0.99
48
1219.2
60
1524
3075
121.1
3053
120.2
-1
0.0
458
18.0
6.8
0.12
0.99
56
1422.4
70
1778
3606
142.0
3581
141.0
14
0.6
519
20.4
6.8
0.12
0.99
64
1625.6
80
2032
4137
162.9
4108
161.7
29
1.1
580
22.9
6.8
0.12
0.99
72
1828.8
90
2286
4668
183.8
4635
182.5
44
1.7
641
25.3
6.7
0.12
0.99
80
2032
100
2540
5199
204.7
5163
203.3
60
2.3
702
27.7
6.7
0.12
0.99
96
2438.4
120
3048
6260
246.5
6217
244.8
90
3.5
825
32.5
6.7
0.12
0.99
120
3048
150
3810
7853
309.2
7800
307.1
135
5.3
1008
39.7
6.7
0.12
0.99
144
3657.6
180
4572
9446
371.9
9382
369.4
181
7.1
1191
46.9
6.7
0.12
0.99
160
4064
200
5080
10508
413.7
10436
410.9
211
8.3
1313
51.7
6.7
0.12
0.99
192
4876.8
240
6096
12631
497.3
12546
493.9
272
10.7
1557
61.3
6.7
0.12
0.99
216
5486.4
270
6858
14224
560.0
14128
556.2
317
12.5
1740
68.5
6.6
0.12
0.99
240
6096
300
7620
15817
622.7
15710
618.5
363
14.3
1923
75.7
Formulas (mm)
H mm=Horizontal Screen Width
C = [(53.2
ןH) / 26.6]– 85.4
α
= Tan -1 (8
ןH) / (26.6ןC)
A =C / cos
α
E = 92.2 + [(8 ןH) / 26.6]
D = (0.375 ןH) – E
A : Distance between the lens and the screen center
C : Horizontal throw distance between the screen surface and the lens
D : Vertical distance between the projector foot and the base of image
E : Vertical distance between the projector foot and the screen center
Formulas (inch)
H inch=Horizontal Screen Width
C = [(50.7
ןH)– 85.4] / 25.4
α
= Tan -1 (8
ןH) / (26.6ןC)
A =C / cos
α
E = [92.2 + (7.6 ןH ) ]/ 25.4
D = (0.375
ןH) – E
Formulas (mm)
H mm=Horizontal Screen Width
C = {[(53.2
ןH )/ 26.6] – 85.4}ן1.3
α
= Tan -1 (8
ןH) / (26.6ןC)
A =C / cos
α
E = 92.2 + [(8
ןH) / 26.6]
D = (0.375
ןH) – E
A : Distance between the lens and the screen center
C : Horizontal throw distance between the screen surface and the lens
D : Vertical distance between the projector foot and the base of image
E : Vertical distance between the projector foot and the screen center
Formulas (inch)
H inch=Horizontal Screen Width
C = {[(50.7
ןH)– 85.4]ן1.3} / 25.4
α
= Tan -1 (8
ןH) / (26.6ןC)
A =C / cos
α
E =[ 92.2 + (7.6
ןH )] / 25.4
D = (0.375
ןH) – E