ISO 14490-3:2021 Optics and photonics — Test methods for telescopic systems —Part 3: Test methods for telescopic sights

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Optics and photonics — Test methods for telescopic systems —Part 3: Test methods for telescopic sights是于2021-03发布的ISO标准,适用于全球范围。

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Optics and photonics — Test methods for telescopic systems —Part 3: Test methods for telescopic sights
Optics and photonics — Test methods for telescopic systems —Part 3: Test methods for telescopic sights(截图)

 

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Optics and photonics — Test methods for telescopic systems —

Part 3: Test methods for telescopic sights

1 Scope

This document specifies test equipment and test procedures for determination of the following optical characteristics of telescopic sights:

— axial parallax;

— parallax;

— eye relief range, eye relief, critical eye relief;

— reticle tracking;

— line of sight shift due to zooming;

— line of sight shift due to focusing.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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, Optics and photonics — Vocabulary for telescopic systems — Part 1: General terms and alphabetical indexes of terms in ISO 14132

ISO 14132-3, Optics and photonics — Vocabulary for telescopic systems — Part 3: Terms for telescopic sights

ISO 14135-1:2021, Optics and photonics — Specifications for telescopic sights — Part 1: General-purpose instruments

ISO 14135-2:2021, Optics and photonics — Specifications for telescopic sights — Part 2: High-performance instruments

3 Terms a nd definiti ons

For the purposes of this document, the terms and definitions given in ISO 14132-1 and ISO 14132-3 apply.

4 Method of measurement of axial parallax

4.1 Principle

This test method describes the measurement of the axial distance between the reticle of a telescopic sight and an image, formed by the objective lens of this telescopic sight (where the reticle is in the first image plane) or by the objective lens and erecting system (where the reticle is in the second image

plane). The distance between the reticle of the telescopic sight and image plane of the collimator reticle −1

along the optical axis, p′ , is expressed in dioptres (m ) and measured with the auxiliary telescope.

ax

4.2 Test arrangement

4.2.1 General

Measurement of the axial parallax shall be carried out with the test arrangement shown in Figure 1.

It shall be possible to adjust the alignment of the collimator and the telescopic sight relative to each other. This can be achieved by adjusting the collimator and/or the telescopic sight.

Key

1 collimator 6 filter

2 telescopic sight 7 reticle of collimator

3 dioptric tester 8 reticle of telescopic sight

4 observer’s eye 9 image plane of collimator reticle

5 illumination unit 10 reticle of dioptric tester

Figure 1 — Test arrangement for measuring axial parallax

4.2.2 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 ten times the diameter of the collimator lens.

The reticle of the collimator should have geometric features appropriate to assess the offset, e.g. a cross-hair. The axial position of this reticle shall be correctly adjusted to form an 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.

To avoid chromatic aberrations, a green filter (~0,55 µm) shall be used.

4.2.3 Telescopic sight

The telescopic sight and/or the collimator shall be adjusted relative to each other so that both optical axes are parallel and in such a position that the objective lens of the telescopic sight is completely illuminated.

The centre of the reticle of the telescopic sight shall be near the optical axis of the sight.

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