Ultra wide-angle eyepiece

Details Ultra wide-angle eyepiece Ultra wide-angle eyepiece

1987-06-01

1988-05-31

Corbin, John K.

350464, 350465, G02B 2504, G02B 960, G02B 962

Patent

active

047476753

ABSTRACT:
Ultra wide-angle eyepieces with relatively long focal lengths and minimal spherical aberration of the exit pupil and field curvature. The eyepieces use six elements in a positive power lens group and two elements in a negative power lens group.

REFERENCES:
patent: 2423676 (1947-07-01), Altman
patent: 2549158 (1951-04-01), Bertele
patent: 3390935 (1968-07-01), Scidmore
patent: 3768890 (1973-10-01), Osawa et al.
patent: 4286844 (1981-09-01), Nagler
patent: 4525035 (1985-06-01), Nagler

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