Compact high-zoom-ratio real-image finder

Details Compact high-zoom-ratio real-image finder Compact high-zoom-ratio real-image finder

1994-06-23

1997-05-06

Metjahic, Safet

Photography

With viewfinder

Selective or adjustable viewfinder field

359688, G03B 1310, G02B 1514

Patent

active

056276184

ABSTRACT:
A high-zoom-ratio real-image finder is provided with an objective lens system including a first lens unit having a positive power, a second lens unit having a negative power, a third lens unit having a negative power and a fourth lens unit having a positive power. Zooming is performed by moving the second and third lens units always in the same direction. A luminous flux restricting member is integrated with a holder for the second lens unit. A zoom strobe unit moves integrally with a holder for the third lens unit.

REFERENCES:
patent: 4572620 (1986-02-01), Kikuchi
patent: 4834513 (1989-05-01), Nozawa
patent: 4842395 (1989-06-01), Sato et al.
patent: 5028125 (1991-07-01), Kikuchi
patent: 5335030 (1994-08-01), Suzuka
patent: 5400101 (1995-03-01), Yoneyama et al.

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