Wide-angle type zoom lens

Details Wide-angle type zoom lens Wide-angle type zoom lens

1978-06-28

1980-04-29

Sacher, Paul A.

350212, G02B 1518

Patent

active

042003580

ABSTRACT:
A zoom lens having a focal length range of about 1:9.5 with a relative aperture of 1:1.4 and whose minimum focal length is made shorter than has heretofore been possible to correspond to an image angle of 56.degree. or more, while good stability of aberration correction is maintained throughout the extended zooming range at the increased relative aperture with limitation of the overall dimensions to a minimum. The lens is suitable for cine cameras of small size and includes a positive first group of four lens elements movable for focusing, negative second and negative third groups axially movable to effect zooming, a positive fourth group acting in afocal manner, and a positive fifth group having an image forming function, the first, fourth and fifth groups being stationary during zooming.

REFERENCES:
patent: 3377119 (1968-04-01), Takano
patent: 4135786 (1979-01-01), Ikemori

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