Viewfinder lens system

Details Viewfinder lens system Viewfinder lens system

1985-03-12

1986-06-10

Perkey, William B.

350410, 350432, G03B 1302, G02B 302

Patent

active

045939845

ABSTRACT:
An improved eyepiece for a viewfinder of a single lens reflex camera is provided. This improved eyepiece includes a negative first lens element and a positive second lens element with an air space formed between the first and second lens elements. The second lens element has an aspheric surface at its object side. The configuration of the aspheric surface is a hyperboloid of revolution.

REFERENCES:
patent: 4217048 (1980-08-01), Egawa
patent: 4265529 (1981-05-01), Yokota
patent: 4389097 (1983-06-01), Ohishi
patent: 4437750 (1984-03-01), Ikari

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