Large aperture zoom lens

Details Large aperture zoom lens Large aperture zoom lens

1976-02-05

1978-08-08

Sacher, Paul A.

350176, G02B 1518

Patent

active

041052919

ABSTRACT:
The present invention relates to a zoom lens comprising four groups, the first group from the side of the object to be photographed presenting a positive refraction power, consisting of a positive compound lens of a negative and a positive lens and of a positive lens seen from the side of the object to be photographed and movable at the time of focussing, the second group presenting a negative refracting power and movable largely forth and back at the time of zooming, the third group presenting a positive refraction power and movable to and from in functional engagement with the second group at the time of zooming, whereby the first, the second and the third group almost composing an afocal system, and the fourth group presenting a positive refraction power and the image forming effect and consisting two positive lenses, a negative lens, a positive lens and a positive compound lens of a positive and a negative lens.

REFERENCES:
patent: 2937572 (1960-05-01), Yamaji
patent: 3045546 (1962-07-01), Cook
patent: 3524696 (1970-08-01), Higuchi
patent: 3912376 (1975-10-01), Ogura et al.
patent: 3937562 (1976-02-01), Muszumanski et al.

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