ISO 14134:2006

INTERNATIONAL ISO
STANDARD 14134
First edition
2006-08-15
Optics and optical instruments —
Specifications for astronomical
telescopes
Optique et instruments d'optique — Spécifications pour télescopes
astronomiques
Reference number
©
ISO 2006
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ii ISO 2006 – 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
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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 14134 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 4,
Telescopic systems.
©
ISO 2006 – All rights reserved iii

.
iv
INTERNATIONAL STANDARD ISO 14134:2006(E)
Optics and optical instruments — Specifications for
astronomical telescopes
1Scope
This International Standard applies to astronomical telescopes, including finder telescopes, and to their
functional specifications.
These specifications are restricted to amateur astronomical telescopes, which should be distinguished from
hand-held or mounted general purpose monocular telescopes.
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 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads
ISO 10109-4:2001, Optics and optical instruments — Environmental requirements — Part 4: Test requirements
for telescopic systems
ISO 14132-1, Optics and optical instruments — Vocabulary for telescopic systems — Part 1: General terms and
alphabetical indexes of terms in ISO 14132
ISO 14132-4, Optics and optical instruments— Vocabulary for telescopic systems— Part4: Terms for
astronomical telescopes
ISO 14490-4, Optics and optical instruments — Test methods for telescopic systems — Part 4: Test methods
for astronomical telescopes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14132-1and ISO 14132-4 shall apply.
4 Specifications
4.1 Optical characteristics: values and tolerances
The values and tolerances for optical characteristics of astronomical telescopes are specified in Table 1.
The characteristics specified in Table 1 shall be measured in accordance with ISO 14490-4.
©
ISO 2006 – All rights reserved 1

Table 1 — Optical characteristics: values and tolerances
Telescope Item Characteristic’s value or tolerance
Refractive ±1,0
Clear aperture of objective (mm)
Reflective ±2,0
Refractive ±2%
Focal length of objective (mm)
Reflective ±3%
Main
Focal length of eyepiece (mm) ±5%
general purpose high performance
Angular resolution in object space and on the optical axis
(arc second) 140
D
D
Magnification ±10 %
Clear aperture of objective (mm) ±1,0
Field of view in the object space (degrees) ±5%
Finder
−1
Reticle parallax (dioptre = m ) ±0,5
Angular resolution on the optical axis (arc second)
Γ
NOTE 1 The resolution on the optical axis is used as a criterion for image quality.
NOTE 2 D = clear aperture of the objective in millimetres.
NOTE 3 Γ = magnification of the finder.
Tolerances for clear aperture and focal length of the objective lens (primary mirror); focal length of the eyepiece;
clear aperture, magnification and angular field of view in objective space of the finder telescope shall be
obtained by taking nominal values as reference.
The
...