Large aperture ratio, long focus lens
A compact, large aperture ratio, long focus lens having a short total length includes, in succession from the object side, a first group comprising a positive meniscus lens having its convex surface facing the object side, a second group comprising a positive meniscus lens having its convex surface...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A compact, large aperture ratio, long focus lens having a short total length includes, in succession from the object side, a first group comprising a positive meniscus lens having its convex surface facing the object side, a second group comprising a positive meniscus lens having its convex surface facing the object side, a third group comprising a negative meniscus lens consisting of a biconvex lens and a biconcave lens cemented thereto and having its convex surface facing the object side, a diaphragm, a fourth group comprising a meniscus lens consisting of a negative lens and a positive lens cemented thereto and having its convex surface facing the image side, and a fifth group comprising a positive lens. |
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