| 摘要 |
PROBLEM TO BE SOLVED: To realize exposure decision which cannot be realized in the conventional method such as transmitted light measurement and reflected light measurement by one plate, to directly obtain exposure to be corrected according to the brightness of a subject at the rear of a light diffused plate in the reflected light measurement, to realize stricter exposure measurement without correcting the exposure after the measurement, for bringing an auxiliary reflector into contact with the back surface of the light diffused plate and to adjust reflectance and a color tone by the auxiliary reflector. SOLUTION: Both of transmissivity and reflectance of a standard gray light diffused plate to be produced are adjusted to about 18 to 20%. When the reflected light is measured, the light diffused plate 3 is used to obtain the measured value corrected according to the brightness of the subject 4 at the rear of the plate 3, and when the plate 3 is used dedicatedly as the reflector, the auxiliary reflector is brought into contact with the back surface of the plate 3 and then used.
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