Xenoter type macrolens
专利汇可以提供Xenoter type macrolens专利检索，专利查询，专利分析的服务。并且PURPOSE:To obtain a macro lens which has large aperture for infinite distance and aberrations corrected excellently over a wide range up to short distance, by forming the lens system of four groups of lenses whose focal length meets prescribed requirement by increasing the length between the 3rd and 4th groups as photographic distance decreases. CONSTITUTION:A macro lens consists of the 1st group 1 of a convex positive meniscus lens on an object side, the 2nd group 2 of a compound lens a convex positive meniscus lens on the object side and a concave negative meniscus lens on an image side, the 3rd group 3 of a convex nagative menisus lens on the image side, and the 4th group 4 of a convexo-convex combined lens of a convex and a concave lens, and the composite focal length (f) of the entire lens system and the composite focal length (f1,2,3) of the 1st-3rd groups of lenses satisfy inequality 1. The floating constitution wherein the gap between the groups 3 and 4 increases as photographic distance decreases is employed, and has an aperture F:2.8 for infinite distance, thus obtaining a xenoter type macrolens which has aberrations corrected excellently over a wide range from the infinite distance to short distance for lateral magnification 1/2.，下面是Xenoter type macrolens专利的具体信息内容。
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