Telephoto lens system

Details Telephoto lens system Telephoto lens system

1985-06-04

1987-12-01

Arnold, Bruce Y.

G02B 900

Patent

active

047099984

ABSTRACT:
A telephoto lens system comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having negative or positive refractive power, the telephoto lens system being arranged to be focused by integrally moving the first through the third lens unit and arranged that the secondary spectrum is corrected extremely favorably, and the variation of aberrations to be caused is small when the lens units are moved for the purpose of focusing, the telephoto lens system being small in size and having high performance.

REFERENCES:
patent: 3942875 (1976-03-01), Betensky
patent: 3942876 (1976-03-01), Betensky
patent: 4240703 (1980-12-01), Momiyama

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