| 摘要 |
An optical apparatus provided with a light receiving device for receiving light distributions from light beams passed through different portions of a pupil of a main imaging lens, a focus state detecting device for detecting the focus state of the main imaging lens from the positional relation between the light distributions received by the light receiving device, a decentration position detecting device for detecting the decentration position of a decenterable lens provided in the main imaging lens, a memory for memorizing inherent data of the main imaging lens which should correct the focus state detection output at each decentration position, and a calculating device for calculating the amount of movement of a focusing lens for focusing by the use of the inherent data read out from the memory conforming to a signal from the decentration position detecting device and the focus state detection output.
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