| 摘要 |
PURPOSE:To extend the macro photographing area for focal length by constituting a mechanism so that the operation limit position of a macro operation ring which controls the distance in the macro photographing distance range is changed in accordance with the set position of a zooming operating ring. CONSTITUTION:In case that the distance is controlled with respect to an object in the macro photographing are, a macro stopper 18 and a notch 3g are disengaged from each other after zooming, macro operation ring 2 is rotated. Then, the first and the second moving cylinders 8 and 9 are moved left along the optical axis, and macro focusing of each lens group in the macro photographing area is possible. A macro limit pin 14 is placed in the position indicated by a solid-line in the wide end state and is placed in a position 14' indicated by a broken line in the telephoto end, and consequently, macro focusing is maximum in the wide end and is reduced toward the telephoto end. When the macro operation ring 2 is operated beyond the operation limit position, the zooming operation ring and the macro operation ring are interlocked with each other. Thus, macro focusing is possible when the zooming operation ring is set to any focal length. |
