| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a focusing plate for performing photometry with high accuracy correspondingly to various interchangeable lenses without using a complex processing method. <P>SOLUTION: In the focusing plate which has a diffusion surface for diffusing light, a first lens portion having a first refractive power, and a Fresnel lens surface having a second lens portion having a larger refractive power than that of the first lens portion arranged therein, the second lens portion has a smaller refractive power according to a distance between the second lens portion and the center of the Fresnel lens surface. <P>COPYRIGHT: (C)2012,JPO&INPIT |
