In this paper, chromaticity co-ordinates of photographic effect of camera lenses corresponding to the six points, which limited the tolerance of ISO/001, is calculated by means of the basic formulae of colorimetry. The color difference of photographic, effects between the lenses according with the six points and the ISO standard camera lens is computed by using the OIE 1964 color difference formulae. According to these results, the rationality of the tolerance of ISO/CCI is discussed and the proposal for dividing the teleranoe of ISO/CCII into two regions is presented.