Optics and optical instruments -- Test methods for telescopic systems

Optique et instruments d'optique -- Méthodes d'essai pour systèmes téléscopiques

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ISO/DIS 14490-6 - Optics and optical instruments -- Test methods for telescopic systems
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DRAFT INTERNATIONAL STANDARD ISO/DIS 14490-6
ISO/TC 172/SC 4 Secretariat: GOST R
Voting begins on Voting terminates on
2002-11-07 2003-04-07

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

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

Optique et instruments d'optique — Méthodes d'essai pour systèmes télescopiques —

Partie 6: Méthodes d'essai de l'indice de lumière parasite diffuse
ICS 37.020

In accordance with the provisions of Council Resolution 15/1993 this document is circulated

in the English language only.

Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est

distribué en version anglaise seulement.

To expedite distribution, this document is circulated as received from the committee

secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at

publication stage.

Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du

secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au

Secrétariat central de l'ISO au stade de publication.

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO

AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.

IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT

INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH

REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
© International Organization for Standardization, 2002
---------------------- Page: 1 ----------------------
ISO/DIS 14490-6
Copyright notice

This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted

under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be reproduced,

stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying, recording or

otherwise, without prior written permission being secured.

Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's member

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Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2002 — All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 14490-6
Contents Page

Foreword ............................................................................................................................................................. iv

1 Scope....................................................................................................................................................... 1

2 Normative references.............................................................................................................................. 1

3 Terms and definitions ............................................................................................................................. 1

4 General..................................................................................................................................................... 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 Measuring and evaluation unit................................................................................................................ 4

7 Procedure ................................................................................................................................................ 4

7.1 Adjustment of the measuring setup ....................................................................................................... 4

7.2 Determination of results.......................................................................................................................... 4

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

A.1 Test equipment........................................................................................................................................ 6

A.2 Measuring the luminance of the black reference surface and of the internal surface of the

integrating sphere ................................................................................................................................... 6

Bibliography......................................................................................................................................................... 8

© ISO 2002 — All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 14490-6
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 optical instruments, 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:
¾ Part 1: Test methods for basic characteristics
¾ Part 2: Test methods for binocular systems
¾ Part 3: Test methods for telescopic sights
¾ Part 4: Test methods for astronomical telescopes
¾ Part 5: Test methods for transmittance
¾ Part 6: Test methods for veiling glare index
¾ Part 7: Test methods for limit of resolution
Annex A of this part of ISO 14490 is for information only.
iv © ISO 2002 — All rights reserved
---------------------- Page: 4 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 14490-6
Optics and optical instruments — Test methods for
telescopic systems —
Part 6:
Test methods for veiling glace 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 normative documents contain provisions which, through reference in this text, constitute provisions of

this part of ISO 14490. For dated references, subsequent amendments to, or revisions of, any of these publications

do not apply. However, parties to agreements based on this part of ISO 14490 are encouraged to investigate the

possibility of applying the most recent editions of the normative documents indicated below. For undated

references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain

registers of currently valid International Standards.

ISO 9358:1994, Optics and optical instruments — Veiling glare of image forming systems — Definitions and

methods of measurement

ISO 14132—1: , Optics and optical instruments — Vocabulary for telescopic systems — Part 1: General terms and

alphabetical indexes of terms in ISO 14132.

ISO 14490—1: , 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 part of ISO 14490 the terms and definitions given in ISO 14132-1 apply.

4 General

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 that this part of ISO 14490 deals with, 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 should be made directly to appropriate clauses of ISO 9358:1994.
1) To be published.
© ISO 2002 — All rights reserved 1
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ISO/DIS 14490-6

From the classification in clause 4 of ISO 9358:1994 the case where both the object and the image are at infinity

will usually apply to telescopic systems. The clauses below give detail
...

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