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Precise focal length adjust-ment according to the screen
size and distance
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Perfect, full-format screen illumination
due to precise focal length adjustment
If visitors to the Museo Centro de Arte
Reina Sofia in Madrid could only see 92% of Pablo Picassos masterpiece
“Guernica” due to space limitations, there would be an uproar. However,
a similar problem often occurs in cine-mas with large screens if the
focal length of the projection lens is not matched precisely to the
screen size.
This no longer has to be the case:
the “Variable Prime” lens series
VP CINELUX covers all focal lengths from 28.9 mm to 63.7 mm
stepless-
ly for the film formats 1:1.37; 1:1.66; and 1:1.85 with 13 lenses.
Every
VP-CINELUX projection lens allows a precise adjustment of focal length
within its specific range; the fine-tuning of the projection image
to the screen size can be carried out easily when the  test film CLT is
running.
A tool is supplied with which the lock can be set to the “UNLOCK”
position; then a mid-range focal length is set and the lens mounted in
the lens holder of the projector. The focus is set while the test film
is running and then the lens is fixed in place in the lens holder. The
image size can now be adjusted using the sensitive focal length
setting with reference to the format limitations of the test
film CLT. Finally, the lens is fixed in the “LOCK” position and, if
necessary, the focus corrected again.
Catalog page (pdf: 700kB) |
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Catalog
pdf
(1,8 MB) |
Technical Information
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Rel. aperture |
1 : 2.0 |
| Lenses |
10 respectively 11 |
|
| f ' |
D2 |
D3 |
L1 |
L2 |
L3 |
s' A
∞ |
s' F' |
| 28,9 -
31,2 |
39 |
|
102,2 |
42,2 |
|
72,4 - 72,6 |
30,59 - 30,36 |
| 30,8 -
33,3 |
39 |
|
102 |
42 |
|
72,4 - 72,7 |
30,91 - 30,64 |
| 33,3 -
35,9 |
39 |
|
102 |
42 |
|
72,5 - 72,8 |
32,36 - 32,05 |
| 35,8 -
38,6 |
39 |
43 |
113,6 |
53,6 |
40 |
84,1 - 84,4 |
33,53 - 33,17 |
| 38,3 -
41,3 |
39 |
43 |
107 |
47 |
40 |
81,5 - 82 |
39,72 - 39,31 |
| 41,1
44,3 |
39 |
43 |
109,8 |
49,8 |
40 |
84,3 - 84,7 |
37,13 - 36,66 |
| 43,4 -
46,9 |
40 |
|
98,5 |
38,5 |
|
69,7 - 70,2 |
34,33 - 33,80 |
| 46,2 -
49,8 |
40 |
|
98 |
38 |
|
72,4 - 73,0 |
37,03 - 36,43 |
| 48,5 -
52,3 |
40 |
|
98 |
38 |
|
74,5 - 75,2 |
39,02 - 38,36 |
| 51,0 -
54,9 |
39 |
|
99,8 |
39,8 |
|
71,6 - 72,3 |
35,00 - 34,27 |
| 51,0 -
54,9 |
39 |
|
99,8 |
39,8 |
|
71,6 - 72,3 |
35,00 - 34,27 |
| 53,7 -
58,0 |
39 |
43 |
93 |
33 |
30 |
65,2 - 66,0 |
36,38 - 35,57 |
| 56,4 -
60,8 |
39 |
43 |
91 |
31 |
30 |
65,3 - 66,2 |
38,83 - 37,92 |
| 59,2 -
63,7 |
39 |
43 |
94,5 |
34,5 |
30 |
68,4 - 69,4 |
38,86 - 37,88 |
All units in mm
f ' - Focal
length,
D1 ... D3 - Diameter, L1 ... L3 - Length,
s 'A ∞ -
Flange focal distance, s' F' - Back focal length |
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