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Refracting Lenses

Overview

Most of the lenses in this range provide a virtually diffraction limited performance over the total field of view and spectral range for which they are designed. The images are large (>10mm diameter) and because the performance is close to the diffraction limit, they can be used with any CCD to a maximum of 2/3”. The colour correction (either a-chromatic or apo-chromatic) is excellent, and some of the lenses are suitable to be used with any type of CCD, but others should be selected according to the sensor with which they are to be used: colour, B/W or NIR sensitive CCD’s. (See the individual specifications).

These lenses have been ruggedised and a-thermalised to maintain performance specification over a temperature range of at least -20°C to 60°C.

Special care is taken in the mechanical design to provide effective baffling, thereby eliminating glint and the “white-washing” of images when bright sources such as the sun are near the edge of the field of view. Every lens is tested and the measured MTF graph is supplied with the lens. Note that due to manufacturing tolerances the actual MTF performance is typically 5 to 10% lower than the design graph.

NOTE: CHROMAR Technology preserves the right to change any design or specification in order to improve a product or to more closely reflect actual performance, however, all effort will be made to maintain form and fit while improving function and performance.

List of Chromar Refracting Lenses

EFL

f/#

ImgHt(semi)

Spectral Ranges

Notes

13

6

3.4

VIS NIR

Built about 1000, gunner&commander sight

16

1.4

3.4

VIS NIR

Designed for Space Applications

17

5

3.4

VIS NIR

Designed only

20

1.5

3.4

UV VIS

Designed only

21

1.56

3.4

VIS NIR

Built, Star camera, several in space

25

5

3.6

NIR SWIR

Designed only

30

6

4.4

VIS NIR

Built about 1000, gunner&commander sight

35

5

4.8

VIS NIR

Designed only

50

5

4.8

SWIR

Designed only

50

5

9.6

VIS

Built

55

5

3.4

VIS

Designed

65

5

4.4

VIS NIR

Built

70

5

4

NIR

Built (Design exists for VIS NIR)

90

5

4.8

VIS NIR

Built

100

1.4

4

LWIR

Designed only

138

6

5

VIS NIR

Built about 1000, gunner&commander sight

140

3

5

VIS NIR

Designed only

200

6

5.4

NIR

Designed only

300

2.8

18

VIS

Built, for Cinematography

327

5

60

VIS NIR

Design only, 120 mm ImgDia, excellent MTF

400

5

26

VIS NIR

Built for South African Sumbandila satellite, 52 mm img diam