DIN ISO 14490-5:2007 Optics and optical instruments - Test methods for telescopic systems - Part 5: Test methods for transmittance (ISO 14490-5:2005);English version of DIN ISO 14490-5:2007-06 has been changed from DIN 58389-2:1996 Telescopes - Photometric parameters for observation telescopes and telescopic sights - Part 2: Determination of spectral transmission.
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