| 摘要 |
An optical device which allows size and cost reductions and enables simultaneous capture of images taken by a first optical system and images taken by a composite optical system composed of the first optical system and a second optical system. A first optical system is adapted to form a first image. A second optical system is disposed on a subject side of the first optical system, and is adapted to form a second image within the first image formed by the first optical system.
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