High magnification range zoom lens

Details High magnification range zoom lens High magnification range zoom lens

1983-03-15

1988-01-19

Corbin, John K.

G02B 1514, G02B 964

Patent

active

047201800

ABSTRACT:
The disclosed zoom lens has at least four lens groups with proper refractive powers operating such that while the third lens group counting from front is held stationary, the first and second lens groups and at least one of the fourth lens group and those that follow are moved axially in differential relation to effect zooming. A given range of variation with zooming of the image magnification of the second lens group and a given differential relation for the zooming movement of the first and second lens groups achieve good stability of aberration correction over an extended zooming range.

REFERENCES:
patent: 4256381 (1981-03-01), Kreitzer
patent: 4527867 (1985-07-01), Fujioka et al.

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