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An iris diaphragm with stepless adjustment from f/¡.7 to f/4.0 for the optimum matching of brightness to the different cinema projection formats



Technical Achievement Award

High-performance lenses with aspheric
surfaces and a variable iris diaphragm

Multiplex theatres with large screens make very high demands on the projection lenses. Our new lens series opens up new design possibilities for cinema presentation in an unsurpassed combination of brightness, flexibility and imaging:

Aspheric technology has been combined with adjustable iris diaphragms for the first time. This allows a uniformity of illumination to be achieved over the total image field right from the maximum aperture of f/1.7 – something previously thought impossible. Stopping down a little can actually even increase the already excellent imaging performance.

The integrated variable diaphragm makes it possible for the first time to match the brightness level of the different cinema formats to one another without changing the projector setting.

The depth of field can be visibly increased by stopping down the lens; possible problems with oblique projection or when projecting with subtitles can thus be countered more easily. The marginal sharpness of the image when projecting onto a screen with greater curvature is likewise improved.

With a fully open aperture, the lamp power of the projector can be reduced over that of a Super-Cinelux 35 lens with the same brightness so that less power is consumed; in addition, the service life of the xenon lamp is thus considerably longer.

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Technical Information

Rel. aperture 1 : 1.7  
Lenses 7  
Range of aperture 1.7 - 4.0
 
f ' D L1 L2 L3 s' A ∞ s' F' MTF
32,5 40 128 22,5 98,5 51,7 30,4
35,0 40 130,5 26,5 97,0 56,8 31,9
37,5 40 140 30,5 102,5 60,4 31,8
40,0 40 138,2 33,7 97,5 66,7 34,5
42,5 46 147 38,4 101,6 76,6 38,7
45,0 46 149,8 40,4 102,4 78,6 39,1
47,5 46 143,6 43,6 93 83 40
50,0 40 90,3 20,8 62,5 51,7 32,7
52,5 40 94,3 24,8 62,5 54,5 31,5
55,0 40 92,7 23,2 62,5 54,4 32,4
57,5 40 88 18,5 62,5 53,4 35,5
60,0 40 90 20,5 62,5 55,2 35,6
62,5 40 92,5 23 62,5 57,3 35,3
65,0 42 94 24,5 62,5 62 39,3
67,5 42 95 25,5 62,5 65,3 40,8
70,0 42 95 25,5 62,5 66,2 41,7
72,5 52 101 31,5 62,5 73,3 43,5
75,0 52 101 31,5 62,5 74,6 44,8
77,5 52 101 31,5 62,5 76,1 46,2
80,0 52 101 31,5 62,5 84,7 56,1
82,5 52 101 31,5 62,5 84,9 49,2
85,0 52 101 31,5 62,5 86,3 49,9
90,0 53,8 123,5 13,8 102,7 61,5 49,8
95,0 53,8 123,6 13,9 102,7 65,7 53,8
100,0 53,8 122,5 14,5 101,0 72,3 58,8

  All units in mm

 f ' - Focal length, D - Diameter, L1 ... L3 - Length,
 s 'A ∞ - Flange focal distance, s' F' - Back focal length,
MTF - Modulation Transfer Function

 

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