| 摘要 |
PURPOSE:To perform close-up photography with proper exposure by providing a prism for range finder correction which is made of a Fresnel lens and an auxiliary lens for close-up photography, and further providing a stroboscopic light quantity correcting plate. CONSTITUTION:The auxiliary lens 1 for close-up photography is fitted to a main body 2 and the center of the optical axis of the correcting prism 3 made of the Fresnel lens is placed on the optical axis X of a photographic lens system L. Further, the stroboscopic light quantity correcting plate 4 made of plastic is provided. A horizontal part 3a for correcting vertical parallax is used as the correcting prism part of a finder optical system (a) and slanting parts 3b and 3c are used as range finder optical systems (b) and (c) arranged at the left and right sides of the horizontal parts 3a so that optical paths for correcting the vertical parallax and horizontal parallax face the subject A. The main body 2 is attached to the front surface of the automatic focusing camera (not shown in figure) to allow high-precision close-up photography, and the quantity of light of a strobe (d) is corrected to correct overexposure. Thus, the close-up tool suitable for the automatic focusing camera is obtained.
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