Telephoto lens system

Details Telephoto lens system Telephoto lens system

1987-04-02

1988-12-27

Arnold, Bruce Y.

350455, G02B 1302, G02B 964

Patent

active

047936983

ABSTRACT:
A telephoto lens system, both compact and capable of close-in focusing, comprising, in order from the object side, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of either power and a fourth lens unit of positive power. There are additionally imposed five numerical conditions on the focal lengths of the lens units, their separation and their displacement. The second and third lens units are displaced by differing amounts for focusing.

REFERENCES:
patent: 4126378 (1978-11-01), Ogino

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