Albada finder

Patent

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Details

350410, G03B 1308

Patent

active

044299788

ABSTRACT:
A four-lens-element albada finder comprising a field mask lens having a field mask and an eyepiece of a positive lens to improve the sight of the visual field and field mask images.

REFERENCES:
patent: 3517582 (1970-06-01), Pituley
patent: 3575082 (1971-04-01), McClune
patent: 4348090 (1982-09-01), Iizuka

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