Abstract: An image rotation adapter that is configured to be detachably mounted between an image capturing lens and a camera main body in a camera and includes a first prism configured to invert the object image passed through the image capturing lens by reflecting an odd number of times object light passed through the image capturing lens and a second prism that is supported rotatably about the optical axis, and that is configured to further invert the object image inverted by the first prism by reflecting an odd number of times the object light passed through the first prism; an operation device configured to perform an operation to rotate the second prism; and a relay optical system configured to re-form the object image passed through the second prism on the light receiving surface of the image pickup device.

Abstract: An image rotation adapter that is configured to be detachably mounted between an image capturing lens and a camera main body in a camera in which the image capturing lens is detachably provided to the camera main body and in which an object image passed through the image capturing lens is formed on a light receiving surface of an image pickup device via a prism incorporated in the camera main body, and that is configured to rotate the object image formed on the light receiving surface of the image pickup device, the image rotation adapter comprising: a first prism that is formed to have an optical path length close to the optical path length of the prism incorporated in the camera main body, that is arranged in an optical path before the object image passed through the image capturing lens is formed at a predetermined position in the image rotation adapter, and that is configured to invert the object image passed through the image capturing lens by reflecting an odd number of times object light passed thro