Compact wide angle lens
AssigneeNippon Kogaku K.K.
InventorKoichi Wakamiya
Life of this patent
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Abstract
A compact wide angle lens comprises, in succession from the object side, a first component which is a positive meniscus lens having its convex surface facing the object side, a second component which is a biconcave lens, a third component which is a positive lens having its surface of sharper curvature facing the object side, a fourth component which is a positive lens, and a fifth component which is a negative meniscus lens having its convex surface facing the image side.
Claims6
A compact wide angle lens system having an angle of view of 60.degree.-70.degree. and a total length as short as the total focal length, f, of the lens system, comprising, in succession from the object side, a first positive meniscus lens component having its convex surface facing the object side, a second biconcave lens component, a third positive lens component having its surface of sharper curvature facing the object side, a fourth positive lens component, and a fifth negative meniscus lens component having its convex surface facing the image side, the lens system satisfying the condition:
- 0.51f<f.sub.4 <1.38f
- where f.sub.4 represents the focal length of said fourth component.
Dependencies are inferred from the claim text.