Inverted telephoto type wide angle lens system

Details Inverted telephoto type wide angle lens system Inverted telephoto type wide angle lens system

1980-05-19

1983-05-10

Corbin, John K.

350463, G02B 964, G02B 1304

Patent

active

043826628

ABSTRACT:
An inverted telephoto type wide angle lens system of an aperture ratio, 1/2.0 and a field angle, 84 degrees is provided. The lens system consists, from the object to the image side, of: a first component of a positive meniscus lens element convex to the object side; a second component of a negative meniscus lens element convex to the object side; a third component of a negative meniscus lens element convex to the object side; a fourth component of a biconvex lens element; an aperture stop; a fifth component of a positive meniscus lens element convex to the object side; a sixth component of a biconvex lens element; a seventh component of a biconcave lens element; an eighth component of a positive meniscus lens element convex to the image side; and a ninth component of overall positive refractive power including at least one lens element. The sixth component can be axially moved relative to the other components in association with the focusing for correcting the aberrations which would occur upon close focusing.

REFERENCES:
patent: 3369853 (1968-02-01), Tolle
patent: 3877795 (1975-04-01), Yamashita
patent: 4025168 (1977-05-01), Sugiyama
patent: 4206973 (1980-06-01), Ikemori
patent: 4217034 (1980-08-01), Sugiyama

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