INVERTED TELEPHOTO-TYPE LENS
The lens has far and near conjugate foci and comprises a negative forward lens element group disposed at that end of the lens of the present disclosure which faces said far conjugate focus and a positive rear lens element group disposed at that end of the lens which faces said near conjugate focus a...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The lens has far and near conjugate foci and comprises a negative forward lens element group disposed at that end of the lens of the present disclosure which faces said far conjugate focus and a positive rear lens element group disposed at that end of the lens which faces said near conjugate focus and separated from said forward lens element group by a substantial air gap. The forward lens element group consists of a first lens component and a biconcave second lens component, said biconcave lens component having a rear surface adjoining said air gap and a forward surface remote from said air gap. Said forward and rear surfaces have radii of curvature r3 and r4, respectively, which meet the condition: |
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