Studies on color reproducibility of coated photographic objectives for the color photography are given, taking into consideration of the fact the maximum sensitivity of the blue sensitive emulsion of color film lies in ultra-violet region. Colorimetrical calculation and experiments show that the color of reflected light from coated objectives which give the most faithful color reproduction is, generally speaking, purple for the objective of F-ratio lies between 3.5 and 4.5, magenta for 2.8_??_2, and amber color for 1.8_??_1.2, according to their degree of ultra-violet absorption.