1984-01-05
1985-06-25
Corbin, John K.
350469, G02B 958, G02B 2504
Patent
active
045250359
ABSTRACT:
A wide angle eyepiece having reduced astigmatism at the edge of the field and comprising a doublet, a singlet, a singlet, and a doublet, wherein the doublets have negative power.
REFERENCES:
patent: 3390935 (1968-07-01), Scidmore
patent: 4286844 (1981-09-01), Nagler
Corbin John K.
Gass Rebecca D.
Keegan William P.
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