ISO 14490-3:2004
(Main)Optics and optical instruments — Test methods for telescopic systems — Part 3: Test methods for telescopic sights
Optics and optical instruments — Test methods for telescopic systems — Part 3: Test methods for telescopic sights
ISO 14490-3:2004 specifies test equipment and test procedures for the determination of the following optical characteristics of telescopic sights: axial parallax; parallax; eye relief range; reticle tracking.
Optique et instruments d'optique — Méthodes d'essai pour systèmes télescopiques — Partie 3: Méthodes d'essai pour viseurs de tir
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14490-3
First edition
2004-02-01
Optics and optical instruments — Test
methods for telescopic systems —
Part 3:
Test methods for telescopic sights
Optique et instruments d'optique — Méthodes d'essai pour systèmes
télescopiques —
Partie 3: Méthodes d'essai pour viseurs de tir
Reference number
ISO 14490-3:2004(E)
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ISO 14490-3:2004(E)
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ISO 14490-3:2004(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
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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 14490-3 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
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iv
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INTERNATIONAL STANDARD ISO 14490-3:2004(E)
Optics and optical instruments — Test methods for telescopic
systems —
Part 3:
Test methods for telescopic sights
1Scope
This part of ISO 14490 specifies test equipment and test procedures for the determination of the following
optical characteristics of telescopic sights:
— axial parallax;
— parallax;
— eye relief range;
— reticle tracking.
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
ISO 14132-3:2002, Optics and optical instruments — Vocabulary for telescopic systems — Part 3: Terms for
telescopic sights
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14132-1 and ISO 14132-3 shall apply.
4 Test methods
4.1 Axial parallax
4.1.1 General
This test method describes the measurement of the axial distance between the reticle of a telescopic sight and
� −1
an image, formed by the objective lens of this telescopic sight. The distance p is expressed in dioptres (m ).
ax
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ISO 14490-3:2004(E)
4.1.2 Requirements for measuring equipment (See Figure 1)
4.1.2.1 Collimator
The collimator shall have a useful diameter larger than the objective lens diameter of the telescopic sight under
test and a focal length of at least 10 times the diameter of the collimator lens.
The reticle of the collimator shall be a cross-hair. The axial position of this reticle shall be correctly adjusted to
form a virtual image at the specified parallax-free distance of the telescopic sight under test.
The illumination unit shall create a uniform brightness over the aperture of the collimator.
0,55µm
To avoid chromatic aberrations, a green filter (approximately ) shall be used.
4.1.2.2 Telescopic sight
The telescopic sight shall be adjusted parallel to the optical axis of the collimator in such a position that the
objective lens of the telescopic sight is completely illuminated.
The reticle of the telescopic sight shall be in the centre of the total adjustment range.
4.1.2.3 Dioptric tester
The dioptric tester shall have an aperture larger than the exit pupil of the telescopic sight and a magnification
sufficient to ensure precise measurement (i.e., ×3 to ×6).
Key
1collimator
2 telescopic sight
3 dioptric tester
4observer’s eye
5 illumination unit
6filter
7 reticle of collimator
8 reticle of telescopic sight
9 image of collimator reticle
10 reticle of dioptric tester
Figure 1 — Schematic test set up: axial parallax
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ISO 14490-3:2004(E)
4.1.3 Measurement procedure
Set the dioptric tester to zero with its eyepiece adjusted to obtain a sharp image of its own reticle.
The eyepiece of the telescopic sight shall be focused on the reticle of the telescopic sight to obtain a sharp
image while viewing through the dioptric tester.
For telescopic sights with fixed eyepiece, use the dioptric tester to focus on the reticle of the telescopic sight.
The dioptre setting of the dioptric tester shall be adjusted to obtain a sharp image of the collimator reticle.
�
The axial parallax in the image space p shall be determined by the difference of the two readings on the
ax
dioptric tester.
�
The measurement error for p shall not exceed
ax
2,7 mm
�2
D
�
where D is the exit pupil diameter, expressed in millimetres.
�
For exit pupil diameters larger than 7mm, the value in the formula shall be D = 7mm.
The axial parallax in the object space p is calculated by
ax
�
p
ax
p =
ax
2
Γ
NOTE The image quality of the telescopic sight influences the measurement error.
4.2 Parallax
4.2.1 General
This method describes the determination of the angular deviation between the aiming lines for on-axis and off-
axis observation.
NOTE For exit pupil diameters of approximately 2mm or less, only the test method for axial parallax is appropriate.
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ISO 14490-3:2004(E)
4.2.2 Requirements for
...
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