Zoom lens

Details Zoom lens Zoom lens

1997-04-07

1998-12-01

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

058447253

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of positive refractive power and a second lens unit of negative refractive power, zooming being performed by varying a separation between the first lens unit and the second lens unit, wherein the first lens unit has at least two positive lenses and at least two negative lenses, and wherein the distance for the telephoto end from the first lens surface to the last lens surface, the diagonal length of the effective area of an image frame, the shortest and longest focal lengths of the entire system are appropriately determined.

REFERENCES:
patent: 5218478 (1993-06-01), Itoh
patent: 5274504 (1993-12-01), Itoh
patent: 5305148 (1994-04-01), Ikemori et al.
patent: 5315440 (1994-05-01), Betensky et al.
patent: 5365376 (1994-11-01), Itoh
patent: 5463449 (1995-10-01), Ito et al.
patent: 5493448 (1996-02-01), Betensky et al.
Shashin Kogyo (Photographic Industries), vol. 51 (Sep. 1993), p. 109.

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