| 摘要 |
A focus detecting apparatus is provided with optical means for forming, from a light beam passed through an objective lens, distributions of intensity of light whose relative position varies in conformity with the focus adjusted state of the objective lens, light receiving means for receiving the distributions of intensity of light and forming a signal indicative of the focus adjusted state of the objective lens, and masking means for regulating the light beam passed through the objective lens to effect detection relative to a desirable position in a scene which is not restricted to a predetermined position.
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