Internal focusing lens

Details Internal focusing lens Internal focusing lens

1984-10-12

1986-11-04

Corbin, John K.

350455, G02B 704, G02B 960

Patent

active

046207740

ABSTRACT:
An internal focusing lens comprising from the object end a first positive group, a second positive group and a third negative group, the second group being axially movable to focus the lens.

REFERENCES:
patent: 4068929 (1978-01-01), Yokota
patent: 4359272 (1982-11-01), Kreitzer

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