Photographical lens of variable focal length
The invention relates to a photographical lens of variable focal length and can be used to meet the demands of miniature film photography. The aim of the invention is to dispense with the use of expensive high-index lanthanum glasses. The object of specifying a lens having a focal length in the rang...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | The invention relates to a photographical lens of variable focal length and can be used to meet the demands of miniature film photography. The aim of the invention is to dispense with the use of expensive high-index lanthanum glasses. The object of specifying a lens having a focal length in the range of 0.8-1.6 times the covered image field diagonal and a relative aperture of greater than 1:2.8 is achieved by constructing the lens from a negative and a positive lens component as well as a plane plate. It is possible to dispense with high-index lanthanum glasses by observing defined conditions. |
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