ISO INTERNATIONAL STANDARD 21094 First edition 2008-02-15 Optics and photonics Telescopic systems Specifications for night vision devices Optiqueetphotonique-Systemes telescopiques-Specifications pour dispositifs de vision de nuit Reference number ISO 21094:2008(E) TSO ii Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been 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. 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. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO21094waspreparedbyTechnical CommitteeISO/TC172,Opticsandphotonics,SubcommitteeSC4 Telescopicsystems. blank Optics and photonics Telescopic systems Specifications fornight visiondevices 1 Scope This International Standard applies to night vision devices such as binoculars, monoculars and goggles that are used for observation activities at night such as rescue actions under low light conditions, urgent repairs in the dark and night time surveillance The International Standard does not cover thermal imaging technology 2Normativereferences 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,Optics and optical instruments—Vocabulary for telescopic systems-Part 1:General terms andalphabeticalindexesoftermsin/so14132 IsO14132-2,Optics andoptical instruments-Vocabularyfortelescopic systems-Part2:Termsfor binoculars,monoculars andspotting scopes Iso14132-51),Optics andoptical instruments—Vocabularyfortelescopic systems-Part5:Termsfornight visiondevices IsO 14490-81), Optics and photonics-Test methods for telescopic systems-Part 8:Test methods for night-visiondevices 3Terms and definitions For terms and definitions that apply to night vision devices refer to ISO 14132-5. ISO14132-1. 1) To be published 1 Specifications 4 4.1 General The tests for compliance of night vision devices to values and tolerances specified in Table 1 and Table 2 shall be carried out in accordance with ISO 14490-8. 4.2 Tolerances Acceptable deviations of the optical characteristics of night vision devices shall be within the limits given in Table 1. Table1Acceptabledeviationsofopticalcharacteristics Values oftolerances Characteristics for binoculars for goggles and monoculars Magnification a, ± 7 % Range of vision b ± 20 % Night vision device gain ± 10 % Field of view in the object space ± 5% ± 10% Eye relief, in millimetres 1 to +5 Zero-setting error of dioptre scale, in dioptres ± 1,0 Image rotation, in degrees of arc ± 1,5 Disparity of image rotations c, in minutes of arc 40 Relative difference in magnification c 2 % 3 % Non-parallelism of axes of beams emergent from eyepieces c, in minutes of arc: dipvergence 30 divergence 100 convergence 40 For variable (zoom or discrete) magnification instruments this refers to minimum and maximum magnifications. For variable (zoom or discrete) magnification instruments this refers to the maximum magnification. Not applicable for monoculars. 2 4.3 Minimumrequirements foroptical characteristics Values of optical characteristics for night vision devices shall be not less of those given in Table 2. Table2Minimumrequirementstoopticalcharacteristics Values Characteristics for binoculars for goggles and monoculars () in minutes of arc Limit of resolution in object space a b (.%) in cycles per milliradian Dioptre adjustment range, in dioptres 4 to +2