Compact telephoto lens

Details Compact telephoto lens Compact telephoto lens

1978-07-28

1980-06-10

Sacher, Paul A.

G02B 960

Patent

active

042069769

ABSTRACT:
A five component Ernostar type telephoto lens having a focal length in the intermediate order up to 135 m/m with a telephoto effect down to 0.84 but with limitation of zonal spherical aberration to a minimum is disclosed. The lens system comprises, from front to rear, a biconvex lens having a far larger front curvature than that of a rear surface thereof, a forwardly convex positive meniscus lens, a negative doublet composed of a forwardly concave front positive meniscus lens element and a rear biconcave lens element and followed, after a large axial air separation, by a negative meniscus lens of forward concavity, and a biconvex lens. The system fulfills the following requirements: ##EQU1##

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