Zoom view finder

Details Zoom view finder Zoom view finder

1988-03-10

1989-08-08

Arnold, Bruce Y.

354219, 354222, G02B 1514, G03B 1302, G03B 1310

Patent

active

048546801

ABSTRACT:
A zoom view finder comprising a plural number of lens units and so adapted as to perform zooming by displacing some of said lens units, said zoom view finder satisfying the following conditions: ##EQU1## wherein the reference symbol z represents zoom ratio of the lens system, the reference symbols .nu..sub.max and .nu..sub.min designate the maximum Abbe's number and the minimum Abbe's number respectively out of Abbe's numbers of said lens units, and the reference symbols P(.DELTA..gamma.).sub.max and P(.DELTA..gamma.).sub.min denotes the maximum and minimum values out of percentages of the chromatic aberrations of angular magnification relative to magnification levels.

REFERENCES:
patent: 3051052 (1962-08-01), Bergstein
patent: 3454321 (1969-07-01), Klein
patent: 3788731 (1974-01-01), Sugiura et al.
patent: 4018510 (1977-04-01), Bertele
patent: 4094587 (1978-06-01), Basanmatter et al.
patent: 4725130 (1988-02-01), Ozawa

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