Real image viewfinder

Details Real image viewfinder Real image viewfinder

1990-12-17

1992-07-14

Sugarman, Scott J.

Optical: systems and elements

Compound lens system

Telescope

354219, 359656, 359835, G02B 2314, G02B 504, G03B 1302

Patent

active

051308452

ABSTRACT:
A real image viewfinder with an objective having movable focusing lens(es) and a field lens at the end thereof furtherest from the field of view, an eyepiece lens and image inverting optics, preferably in the form of a Type II Porro prism wherein the real image is focused to fall on a surface of the field lens, which is desirably a plano surface facing the inverting optics. This field lens surface is also at the focus of the eye piece lens. A pattern (a reticle) is located on the field lens surface. Since the objective forms a focus at the location of the reticle, observation of the reticle indicates when the objective is focused. A camera picture taking lens may be coupled to a movable lens in the objective for focusing the taking lens.

REFERENCES:
patent: 4318584 (1982-03-01), Ando et al.

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