Keywords:
Aperture, CIE chromaticity coordinate, Colour rendering index, Colour value, Determination, Enlarging, Illumination engineering, Mathematical calculations, Measurement, Measuring techniques, Monoculars, Optical, Optical equipment, Optical instruments, Optics, Parameters, Ratings, Sensitivity levels, Sighting telescopes, Specification (approval), Spectral, Telescopes, Testing, Transmittance, Transmittances