Real image zoom viewfinder

Details Real image zoom viewfinder Real image zoom viewfinder

1994-06-22

1996-03-19

Blankenship, Howard B.

Optical: systems and elements

Prism

With reflecting surface

359689, G03B 1310

Patent

active

055007031

ABSTRACT:
A real image zoom finder has a zoom portion with one or more moving elements to vary the magnification of the finder. A field lens is substantially separated from suitable erecting optics to defocus any scratches or dust on the zoom lens and also to increase the compactness of the system.

REFERENCES:
patent: 4751539 (1988-06-01), Yamada et al.
patent: 5130845 (1992-07-01), Ruben
patent: 5173806 (1992-12-01), Ogata
patent: 5220458 (1993-06-01), Ohshita
patent: 5323264 (1994-06-01), Kato

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