Zoom lens system of inner focus type

Details Zoom lens system of inner focus type Zoom lens system of inner focus type

1989-02-09

1991-03-26

Sugarman, Scott J.

G02B 1514

Patent

active

050023730

ABSTRACT:
A zoom lens system of inner focus type including a first lens group having positive refractive power, a second lens group having positive refractive power and a third lens group having negative refractive power. The zoom lens system is so designed as to perform focusing by shifting the second or third lens group for a short distance along the optical axis and to minimize variation of aberrations caused due to focusing.

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patent: 4776680 (1988-10-01), Tanaka
patent: 4842385 (1989-06-01), Tanaka

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