Real image zoom finder

Details Real image zoom finder Real image zoom finder

1998-07-09

2000-03-07

Epps, Georgia

Optical: systems and elements

Compound lens system

Variable magnification

359753, G02B 1514

Patent

active

06034816&

ABSTRACT:
The invention comprises a real image zoom finder including an objective lens group, an erecting group, and an eyepiece lens group. The objective lens group includes a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens having a positive refractive power. The surface of the fourth lens closest to the image side of finder is convex and the second lens is biconvex. The real image zoom finder has a simple structure and good performance for all magnification ranges.

REFERENCES:
patent: 5257129 (1993-10-01), Morooka et al.

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