Zoom objective

Details Zoom objective Zoom objective

1982-02-09

1984-06-26

Corbin, John K.

350423, G02B 964, G02B 1518

Patent

active

044563418

ABSTRACT:
A telephoto zoom objective having, from front to rear, a varifocal part and a fixed part, the aforesaid varifocal part having a 1st group of positive power movable for focusing, a 2nd group of negative power movable for varying the image magnification and a 3rd group of positive power movable for compensating for the image shift resulting by the variation of the image magnification. The fixed part has a 4th group of positive power consisting of two positive lenses of strong convex curvature towards the front and a negative lens, and a 5th group of negative power consisting of a negative meniscus lens of convex curvature toward the rear and a positive lens, wherein the aforesaid lenses of the 4th and 5th groups are given predetermined conditions to achieve good correction of aberrations.

REFERENCES:
patent: 4368954 (1983-01-01), Tsuji
patent: 4380377 (1983-04-01), Sato et al.

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