Albada type zoom finder

Details Albada type zoom finder Albada type zoom finder

1988-01-25

1989-05-30

Arnold, Bruce Y.

350432, 354222, G02B 2314, G02B 936

Patent

active

048345130

ABSTRACT:
A zoom finder with an Albada System comprising, beginning on the object side, a first lens component having positive refractive power, a second lens component having negative refractive power, a third lens component having negative refractive power and provided with a half mirror on a surface of an image side thereof, and a fourth lens component have positive refractive power and provided with a frame on a surface of an object side thereof, wherein said Albada System is constructed by said third lens component and said fourth lens component; said zoom finder with an Albada System is arranged to be zoomed by moving said second lens component; high magnification, a high magnification ratio, a large angle of view and compact size are provided; and various aberrations are properly corrected. The frame may be provided on the optical member arranged in the vicinity of the fourth lens component on the object side thereof. Further, a field frame may alternatively be provided on the optical member and a focusing frame may also be provided on the surface of the object side of the fourth lens component.

REFERENCES:
patent: 4136939 (1979-01-01), Abe

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