ISO 14490-1:2005

INTERNATIONAL ISO
STANDARD 14490-1
First edition
2005-10-15
Optics and optical instruments — Test
methods for telescopic systems —
Part 1:
Test methods for basic characteristics
Optique et instruments d'optique — Méthodes d'essai pour systèmes
télescopiques —
Partie 1: Méthodes d'essai des caractéristiques fondamentales

Reference number
©
ISO 2005
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ii © ISO 2005 – All rights reserved

Contents Page
Foreword. v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Method of measurement of the angular magnification.2
4.1 General.2
4.2 Test arrangement.2
4.3 Procedure .3
4.4 Determination of results .3
4.5 Test report .3
5 Method of measurement of the entrance pupil diameter.3
5.1 General.3
5.2 Test arrangement.3
5.3 Procedure .4
5.4 Determination of results .4
5.5 Test report .4
6 Method of measurement of the exit pupil diameter and eye relief .4
6.1 General.4
6.2 Test arrangement.5
6.3 Procedure .5
6.4 Determination of results .5
6.5 Test report .6
7 Method of measurement of the angular field of view in the object space.6
7.1 General.6
7.2 Test arrangement.6
7.3 Procedure .6
7.4 Determination of results .7
7.5 Test report .7
8 Method of measurement of the angular field of view in the image space .7
8.1 General.7
8.2 Test arrangement.7
8.3 Procedure .8
8.4 Determination of results .9
8.5 Test report .9
9 Method of measurement of the angular field of view in the object space for spectacle
wearers .9
9.1 General.9
9.2 Test arrangement.9
9.3 Procedure .9
9.4 Determination of results .11
9.5 Test report .11
10 Method of measurement of the collimation of rays emergent from the eyepiece .11
10.1 General.11
10.2 Test arrangement.11
10.3 Procedure .12
10.4 Determination of results .12
10.5 Test report .12
11 Method of measurement of the image rotation. 12
11.1 General . 12
11.2 Test arrangement . 12
11.3 Procedure. 13
11.4 Determination of results. 13
11.5 Test report. 13
12 Method of determination of the closest distance of observation . 14
12.1 General . 14
12.2 Test arrangement . 14
12.3 Procedure. 14
12.4 Determination of results. 14
12.5 Test report. 14
13 General test report . 14

iv © ISO 2005 – All rights reserved

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 14490-1 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

INTERNATIONAL STANDARD ISO 14490-1:2005(E)

Optics and optical instruments — Test methods for telescopic
systems —
Part 1:
Test methods for basic characteristics
1 Scope
This part of ISO 14490 specifies the test methods for the determination of the following basic characteristics of
telescopic systems and observational telescopic instruments:
⎯ angular magnification (see Clause 4);
⎯ entrance pupil diameter (see Clause 5);
⎯ exit pupil diameter and eye relief (see Clause 6);
⎯ angular field of view in the object space (see Clause 7);
⎯ angular field of view in the image space (see Clause 8);
⎯ angular field of view in the object space for spectacle wearers (see Clause 9);
⎯ collimation of the bundle of rays emergent from the eyepiece (see Clause 10);
⎯ image rotation (see Clause 11);
⎯ closest distance of observation (see Clause 12).
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 14132-1:2002, Optics and optical instruments — Vocabulary for telescopic systems — Part 1: General
terms and alphabetical indexes of terms in ISO 14132
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14132-1 apply.
4 Method of measurement of the angular magnification
4.1 General
In accordance with ISO 141
...