Zoom lens system having enlarged range of variation in magnifica

Details Zoom lens system having enlarged range of variation in magnifica Zoom lens system having enlarged range of variation in magnifica

1975-08-14

1977-04-05

Corbin, John K.

350184, 350212, G02B 1502, G02B 1514

Patent

active

040158950

ABSTRACT:
A zoom lens system wherein the distance between the rearmost lens surface in the afocal zooming lens portion and the foremost lens surface in the image forming lens system is kept unchanged and an afocal magnification varying lens is inserted into the above described distance so as to enlarge the telefoto range, the magnification varying lens consisting of a front convergent lens group and a rear divergent lens group. The requirements for the magnification varying lens are so set that compensation for aberrations is kept in superior condition when zooming is effected by the lens system with the magnification varying lens being eliminated therefrom, while, when zooming is effected under the condition the magnification varying lens is added to the lens system, the aberrations are also well compensated for.

REFERENCES:
patent: 3558225 (1971-01-01), Kirchoff
patent: 3751136 (1973-08-01), Kirchoff

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