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Optics and optical instruments. Test methods for telescopic systems - Test methods for binocular systems Ingestion-build-143074 BS EN IEC 62031 will1 Scope This part of ISO 14490 is applicable to binocular telescopic systems and specifies the test methods for determination of the following characteristics: non parallelism of the axes of bundles of rays emergent from the eyepieces; interpupillary distance; relative difference in magnification; focusing difference between telescopes of binocular systems.