| 摘要 |
A photometering apparatus for measuring the brightness of an object to be photographed, includes a condenser lens having at least one aspheric lens surface for condensing a bundle of rays reflected from the object. A diaphragm is provided at a predetermined distance behind the condenser lens with respect to the object, and a split type light receiving device is provided behind the diaphragm to receive light which passes through the diaphragm. These elements satisfy the condition represented by the formula 0.3</=LASP/TL</=0.7, wherein "T" represents the distance between the surface of the condenser lens nearer to the object to be photographed and the light receiving device, and wherein "LASP" represents the reduced distance between the aspheric surface of the condenser lens and the diaphragm. The term "LASP" is defined by the relationship LASP=(dL/N)+ds, wherein "dL" represents the thickness of the lens, "ds" the distance between the diaphragm and the surface of the lens nearer to the image, and "N" the refractive index of the lens at the e-line.
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