| 摘要 |
An optical apparatus includes an image pickup part arranged to convert a light flux representative of an object image into an image signal, a detecting part arranged to detect information on the object image by using the image signal, a discriminating part arranged to discriminate the size of a main object by using the information on the object image detected by the detecting part, and a deciding part which decides, on the basis of a discrimination made by the discriminating part, a focal length of an optical system to be changed.
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