Telephoto zoom lens

Details Telephoto zoom lens Telephoto zoom lens

1983-05-03

1987-01-27

Corbin, John K.

350423, G02B 15163

Patent

active

046390952

ABSTRACT:
A telephoto zoom lens having three lens groups of which the 1st, counting from front, is of positive refractive power, the 2nd is of negative refractive power, and the 3rd is of positive refractive power, wherein the aforesaid 1st and 2nd lens groups are made movable to change the focal length of the entire system. Numerical limits or ranges for certain designated features of the lens system, for example, the differential relation in which the 1st and 2nd lens groups move when zooming, their focal lengths, and the image magnification of the 2nd lens group, are properly specified so as to achieve good stability of aberration correction throughout the range.

REFERENCES:
patent: 4240700 (1980-12-01), Ogawa et al.
patent: 4449791 (1984-05-01), Terasawa et al.
patent: 4478496 (1984-10-01), Kato
patent: 4501475 (1985-02-01), Fujita et al.

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