Zoom lens

Details Zoom lens Zoom lens

1989-07-05

1991-02-12

Dzierzynski, Paul M.

350450, 350427, G02B 960

Patent

active

049919458

ABSTRACT:
A zoomable telephoto lens, comprising only five elements. The first three elements form a positive group and the last two elements form a negative group. The airspace between the two groups is made variable to effect zooming.

REFERENCES:
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4772106 (1988-09-01), Ogata et al.
patent: 4815830 (1989-03-01), Sato et al.
patent: 4911539 (1990-03-01), Tsunashima et al.

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