ISO 8478:2017规定了测量相机镜头光谱透射率的方法。它描述了在350 nm至700 nm波长范围内测量主要用于拍摄非常遥远物体的相机镜头轴向光谱透射率的特殊条件。 如果在整个ISO 8478:2017中，光谱透射率值专门用于计算ISO颜色贡献指数（见ISO 6728），则波长范围为370 nm至680 nm。 ISO 8478:2017也适用于镜面透镜（见附录A）。

ISO 8478:2017 specifies a method for measuring the spectral transmittance of camera lenses. It describes particular conditions for measuring the axial spectral transmittance, over a wavelength range from 350 nm to 700 nm, of camera lenses which are intended to be used mainly for taking pictures of very distant objects. If the spectral transmittance values are used exclusively for the calculation of the ISO colour contribution index (see ISO 6728) throughout ISO 8478:2017, the wavelength range reads 370 nm to 680 nm. ISO 8478:2017 is also applicable to mirror lenses (see Annex A).