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Volume 40
-— -,
INTERNATIONAL PROJECTIONIST
February, 1965
Number 2
Part III
Technical Report on the 70 mm Sound System
In order to assist you in the installation of 70mm projectors, as well as screens, screen masking, and sound considerations, the engineering department of UniversalInternational has compiled technical information data.
A feature is the screen chart which will facilitate
By Walter Beyer
Head of Engineering Research Department Universal City Studios
screen size, all computed for the new 70mm projector aperture. This is the first chart of its kind ever computed for 70mm projection. A selection of easy-to-use formulas has also been provided in case your theatre requires deviation from the screen chart. (Figure 1)
the sel
ection
of
proper
focal
leng
th lenses for your A drawing
showing the
recommended
aperture for j
SCREEN CHART FOR 70 MM PROJECTION
LENS FOCAL LENGTH IN MM AND INCHES
66 MM
70 MM
75 MM
80 MM
85 MM
90 MM 95 MM f 4'/4" 41/4"
43/4
5
5>/«
5W
5%"
6"
25
34.0
36.0
38.6
41.2
43.7
46.3 48.9 52.3 55.5 58.8
62.1
65.3
68.6
71.9
75.1
78.4
30
40.7
43.2
46.3
49.4
52.5
55.6 58.7 62.7 66.6 70.6
74.5
78.4
82.3
86.3
90.2
94.1
CONVERSION
35 40
47.6 54.4
50.4 57.6
54.0 61.7
57.6 65.9
61.2 70.0
64.8 68.4 73.2 77.7 82.3 74.1 78.2 83.6 88.7 94.1
87.0 993
915 104.5
96.1 1098
100.6 115.0
105.2 120.2
109.8 125.5
TABLE MM TO INCHES
66 2.60
h
45
61.2
64.8
69.4
74.1
87.7
83.3 88.0 94.1 99.9 105.9
111.7
117.6
123.5
129.4
135.3
141.1
70 2.76
bj
50
68.0
72.0
77.2
82.3
87.5
92.6 97.8 104.5 111.1 117.6
124.2
130.7
132X1
143.8
150.3
156.8
75 2.95
u.
z
55 60
74.7 81.5
79.2 86.4
84.9 92.6
90.6 98.8
96.2 104.9
101.9 107.5 115.0 122.2 129.4 111.1 117.3 125.5 133.3 141.1
136.6 149.0
143.8 156.8
150.9 164.7
158.1 172.5
165.3 180.3
172.5 188.2
80 3.15 85 3.35 90 3.54
1a
*
65
88.3
93.6
100.3
107.0
113.7
120.4 127.0 135.9 144.4 152.9
161.4
1699
178.4
186.9
195.4
2035
95 3.74
70
95.1
100.8
108.0
115.3
122.4
129.6 136.9 146.4 155.5 164.7
173.8
183.0
192.1
201.3
210.4
219.6
UJ
75
102.0
108.0
115.7
123.5
131.2
138.9 146.6 156.8 166.6 176.4
186.2
196.0
205.8
215.6
225.4
2352
IE
3
80
108.7
115.2
123.4
131.7
140.0
148.2 156.4 176.3 177.7 188.2
198.6
209.1
219.6
230.0
240.5
2505
O
85
115.5
122.5
131.2
140.0
148.7
157.4 166.2 177.7 188.8 2O0.0
211.1
222.2
2333
244.4
255.5
266.6
0.
90
122.3
129.7
1389
148.2
157.4
166.7 176.0 188.2 199.9 211.7
223.5
235.2
247.0
258.8
270.5
2823
95
129.1
136.9
146.6
156.4
166.2
175.9 185.7 198.6 211.1 223.5
235.9
248.3
260.7
273.1
285.5
298.0
100
135.9
144.0
154.3
164.7
174.9
185.2 195.5 209.1 222.2 235.2
248.3
261.4
274.4
287.5
300.6
313.6
105
142.7
151.3
162.0
172.9
183.6
194.5 205.3 219.6 233.3 247.0
260.7
274.4
288.2
301.9
315.6
329.3
110
149.5
158.5
169.7
181.1
192.4
203.7 215.0 230.0 244.4 258.8
273.1
287.5
301.9
316.3
330.6
345.0
120
163.0
172.9
185.2
197.6
209.9
222.2 234.6 254.9 266.6 283.3
298.0
313.6
329.3
345.0
360.7
376.4
.
FIGURES IN THE ABOVE TABLE SHOW PROJECTION DISTANCE IN FEET FROM PROJECTOR APERTURE TO CENTER OF SCREEN.
Width:
25
30 35
40
45
50
55 60 65 70 75 80
85
90
95 100
105
110
120
Height:
11.3
13.6 15.8 18.1
20.4
22.6
24.9 27.1 29.4 31.7 33.9 36.2
38.5
40.7
43.0 45.2
47.5
49.8
54.3
'
Figure 1
International Projectionist
Feb
ruarv.
1965