| 摘要 |
PURPOSE:To facilitate the focusing of an objective and to make its magnifica tion constant by allowing a lens barrel to move in two axial directions parallel to the light receiving surface of a camera with the degree of freedom while holding its optical distance constant. CONSTITUTION:The lens barrel 3 is supported movably in the area of the light receiving surface of the camera 2 in parallel to the light receiving surface and the lens barrel 3 is bent by 90 deg. at a proper position and a reflecting mirror 6 is provided at the bend at 45 deg. to the optical axis of the objective 5. Then the lens barrel 3 is moved in parallel to form an image on the light receiving surface of the camera 2. Consequently, while fixing the camera 2, the image can be focused on an observing object point and the handling is facilitated. Further, the optical distance between the objective lens 5 and the light receiving surface can be held constant, so the magnification is made constant at all times.
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