ISO 21094:2008

Overview

ISO 21094:2008, "Optics and photonics - Telescopic systems - Specifications for night vision devices," defines optical specifications, tolerances and minimum performance requirements for night vision devices such as binoculars, monoculars and goggles used for nighttime observation (rescue, urgent repairs in the dark, nighttime surveillance). The standard excludes thermal imaging technology and references test methods and vocabularies in related ISO documents.

Key topics and technical requirements

• Scope and exclusions
  • Applies to night vision telescopic systems used for low-light observation; thermal imaging is not covered.
• Test methods
  • Compliance testing is to be performed in accordance with ISO 14490-8 (test methods for night-vision devices).
• Tolerances and deviations
  • Example optical tolerances specified (from the standard’s tables):
    • Magnification: ±7%
    • Range of vision: ±20%
    • Night vision device gain: ±10%
    • Field of view (object space): ±5% for binoculars; ±10% for goggles/monoculars
    • Zero-setting error of dioptre scale: ±1.0 D
    • Image rotation: ±1.5 minutes of arc
• Minimum optical requirements
  • Dioptre adjustment ranges: binoculars −4 to +2 D; goggles/monoculars −5 to +2 D
  • Eye relief: at least 12 mm for binoculars; 15 mm for goggles/monoculars
  • Interpupillary distance adjustment: typically 60–70 mm (not applicable to monoculars)
  • Close focus (where applicable): e.g., 0.3 m for goggles/monoculars
  • Field imperfections: limits on acceptable spot sizes in the central field
• Consumer information and marking
  • Required or recommended product data: magnification, manufacturer/trademark, country of origin, serial number, field of view, eye relief, range of vision, limit of resolution, gain, power type, operational temperature, mass, and other relevant characteristics.

Applications and practical value

• Ensures consistency in optical performance and user safety for night-vision binoculars, monoculars and goggles.
• Useful for:
  • Manufacturers designing and validating night-vision optics
  • Test laboratories performing compliance measurements (per ISO 14490-8)
  • Procurement officers specifying performance requirements for rescue teams, field maintenance crews, security and surveillance units
  • Product marketers and technical documentation teams who must supply standardized consumer information

Who uses this standard

• Optical and photonics manufacturers
• Quality and compliance engineers
• Test laboratories and calibration facilities
• Emergency services and procurement specialists specifying night-vision equipment

Related standards

• ISO 14132 series (vocabulary for telescopic systems: Parts 1, 2, 5)
• ISO 14490-8 (test methods for night-vision devices)

By following ISO 21094:2008, stakeholders ensure interoperable, measurable and documented performance of night vision devices within the defined optical and photometric tolerances. Keywords: ISO 21094:2008, night vision devices, telescopic systems, optics and photonics, binoculars, monoculars, goggles, ISO 14490-8.