Viewfinder optics with zero power doublet

Details Viewfinder optics with zero power doublet Viewfinder optics with zero power doublet

1976-08-23

1978-04-25

Corbin, John K.

350189, G02B 2314

Patent

active

040860000

ABSTRACT:
A chromatically neutral viewfinder optical system of positive forward and rearward elements and including therebetween a substantially zero power doublet which neutralizes chromatic errors generated by the positive elements.

REFERENCES:
patent: 2872845 (1959-02-01), Baker

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