Telephoto macrolens
专利汇可以提供Telephoto macrolens专利检索，专利查询，专利分析的服务。并且PURPOSE: To decrease the extent of movement for focusing with a little variation in focal length even in unmagnification photography by composing a telephoto microlens of the 1st lens group having positive refracting power, the 2nd lens group having negative refracting power, and the 3rd lens group having positive refracting power successively from an object side, and moving the lens group differently from one another and satisfying specific inequalities.
CONSTITUTION: When the lens is put in focus from infinite distance to short distance, specific inequalities are satisfied while the 1stWthe 3rd lens groups IWIII are all moved differently so that the air gap between the 1st lens group I and the 2nd lens group II and the gap lens between the 2nd lens group II and the 3rd lens group III vary increase and decrease respectively in maximum macro magnification photography. Namely, 1.1 1 23 1 is the focal length of the 1st lens groups I, and D
23 is the on-axis air gap between the 2nd lens group II and the 3rd lens group III in infinite-distance focusing.
COPYRIGHT: (C)1986,JPO&Japio，下面是Telephoto macrolens专利的具体信息内容。
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