ISO 14490-6:2005

Optics and optical instruments — Test methods for telescopic systems — Part 6: Test methods for veiling glare index

ISO 14490-6:2005 specifies the test methods for the determination of the veiling glare index of telescopic systems and observational telescopic instruments.

Optique et instruments d'optique — Méthodes d'essai pour systèmes télescopiques — Partie 6: Méthodes d'essai de l'indice de lumière parasite

General Information

• Status: Withdrawn
• Publication Date: 20-Oct-2005
• Withdrawal Date: 20-Oct-2005
• ICS: 37.020 - Optical equipment
• Technical Committee: ISO/TC 172/SC 4 - Telescopic systems
• Drafting Committee: ISO/TC 172/SC 4 - Telescopic systems
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 17-Oct-2014

Relations

• Revised: ISO 14490-6:2014 - Optics and photonics — Test methods for telescopic systems — Part 6: Test methods for veiling glare index
• Effective Date: 15-Mar-2014

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14490-6
First edition
2005-10-15

Optics and optical instruments — Test
methods for telescopic systems —
Part 6:
Test methods for veiling glare index
Optique et instruments d'optique — Méthodes d'essai pour systèmes
télescopiques —
Partie 6: Méthodes d'essai de l'indice de lumière parasite




Reference number
ISO 14490-6:2005(E)
©
ISO 2005

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ISO 14490-6:2005(E)
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ii © ISO 2005 – All rights reserved

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ISO 14490-6:2005(E)
Contents Page
Foreword. iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 General considerations.1
5 Principle.2
6 Test arrangement.2
6.1 General.2
6.2 Integrating sphere.3
6.3 Object-side collimator .3
6.4 Test specimen mounting .4
6.5 Limiting stop .4
6.6 Measurement and evaluation unit.4
7 Procedure .4
7.1 Adjustment of the measurement set-up.4
7.2 Determination of results .5
8 Presentation of results.5
9 Repeatability.5
10 Test report .5
Annex A (informative) Method for determination of the luminance ratio of the black reference
surface to the internal surface of the integrating sphere.6
Bibliography .8

© ISO 2005 – All rights reserved iii

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ISO 14490-6:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14490-6 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 4,
Telescopic systems.
ISO 14490 consists of the following parts, under the general title Optics and optical instruments — Test
methods for telescopic systems:
⎯ Part 1: Test methods for basic characteristics
⎯ Part 2: Test methods for binocular systems
⎯ Part 3: Test methods for telescopic sights
⎯ Part 4: Test methods for astronomical telescopes
⎯ Part 5: Test methods for transmittance
⎯ Part 6: Test methods for veiling glare index
⎯ Part 7: Test methods for limit of resolution
The following part is under preparation:
⎯ Part 8: Test methods for night-vision devices

iv © ISO 2005 – All rights reserved

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INTERNATIONAL STANDARD ISO 14490-6:2005(E)

Optics and optical instruments — Test methods for telescopic
systems —
Part 6:
Test methods for veiling glare index
1 Scope
This part of ISO 14490 specifies the test methods for the determination of the veiling glare index of telescopic
systems and observational telescopic instruments.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 9358:1994, Optics and optical instruments — Veiling glare of image forming systems — Definitions and
methods of measurement
ISO 14132-1:2002, Optics and optical instruments — Vocabulary for telescopic systems — Part 1: General
terms and alphabetical indexes of terms in ISO 14132
ISO 14490-1:2005, Optics and optical instruments — Test methods for telescopic systems — Part 1: Test
methods for basic characteristics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14132-1 apply.
4 General considerations
The veiling glare test methods are generally described in ISO 9358:1994. ISO 9358:1994 deals with arbitrary
optical instruments and contains two basic approaches to measuring the veiling glare, namely integral (or
black patch) method and analytical (or glare spread function) method.
For terrestrial telescopes with which this part of ISO 14490 deals, the black patch method is more adequate
while the glare spread function may prove to be better for astronomical telescopes. For the moment,
consideration in this part of ISO 14490 is given only to the black patch method. If need of measuring the glare
spread function arises, the reference shall be made directly to appropriate clauses of ISO 9358:1994.
From the classification given in Clause 3 of ISO 9358:1994, the case where both the object and the image are
at infinity will usually apply to telescopic systems. Clauses 6 and 7 give detailed and more specific description
of the general test method given in 4.1 of ISO 9358:1994 and of test conditions given in 5.1 of ISO 9358:1994.
© ISO 2005 – All rights reserved 1

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ISO 14490-6:2005(E)
5 Principle
The determination of the veiling glare index S is based upon the measurement of the illuminance of the image
of a black surface in diffuse scattered white light and the measurement of the illuminance of the image of the
white background.
The veiling glare of an optical instrument is determined by the ratio of the illuminance E of the image of a
1
black surface within a white illuminated wide surface to the illuminance E of an image of a totally white
2
surface.
E
1
S= (1)
E
2
NOTE  In both cases, the white surface ensures a homogenous distribution of the illumination across the whole
entrance pupil of the test specimen.
6 Test arrangement
6.1 General
The measurement set-up consists of an integrating sphere, an object-side
...