| 摘要 |
A focus detection apparatus includes a pupil dividing device for dividing an exit pupil of an objective lens into separate areas, a field mask located at a position substantially optically equivalent to an image forming position of the objective lens, a condenser lens located in the vicinity of the field mask to make the exit pupil conjugate with the pupil dividing device, a light quantity distribution forming device for receiving light transmitted through the separate areas and forming light quantity distribution portions wherein the relative position of the light quantity distribution portions varies in accordance with a focus state of the objective lens, and a focus detection apparatus having at least one group of photoelectric transducers which receive the light quantity distributed by the pupil dividing device. The condenser lens is moved in accordance with the position of the exit pupil of the objective lens.
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