Inverted telephoto lens system

Details Inverted telephoto lens system Inverted telephoto lens system

1978-02-27

1979-11-20

Clark, Conrad J.

G02B 1304

Patent

active

041748867

ABSTRACT:
A wide angle lens system of an inverted telephoto type is provided. The lens system comprises six separate lens groups comprising, consecutively from the object to the image side a negative meniscus lens element; a positive doublet; a positive meniscus lens element; a biconcave single lens element; a positive lens element and a rear positive lens element. One of the lens elements of the fifth and sixth groups is a single lens element while the other is a doublet. The lens is capable of providing an aperture ratio greater than F/2.0, a field angle of approximately 64 degrees and a back focal distance greater than the focal length of the system.

REFERENCES:
patent: 3318653 (1967-05-01), Macher
patent: 3467464 (1969-09-01), Ruehl

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