Internal focusing telephoto lens

Details Internal focusing telephoto lens Internal focusing telephoto lens

1980-09-04

1982-11-16

Corbin, John K.

G02B 960, G02B 1302

Patent

active

043592724

ABSTRACT:
A new and improved telephoto lens comprising a stationary front positive group, a movable second group employed for internal focusing, a stationary third positive group and a stationary fourth negative group. The lens has a very low telephoto ratio and a very short focusing motion accompanied by a high degree of aberrational correction, all of which is achieved without the use of crystalline or expensive glass materials.

REFERENCES:
patent: 3597048 (1971-08-01), Bertele
patent: 3854797 (1974-12-01), Yokota
patent: 3883229 (1975-05-01), Determann et al.
patent: 4037935 (1977-07-01), Momiyama
patent: 4126378 (1978-11-01), Ogino

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