Patent
1989-06-28
1991-03-19
Henry, Jon W.
350559, 350254, 350257, G02B 2300, G02B 1510, G02B 704, G02B 714
Patent
active
050005561
ABSTRACT:
Auxiliary lens cylinders constituting a tele-or wide-conversion lens system can be held in and away from the front of the objective lenses of a binocular telescope, so that the main lens system of the binocular telescope can be converted to a highly magnifying tele-conversion or wide-conversion system without influencing the position of image obtained with the main lens system.
REFERENCES:
patent: 841262 (1907-01-01), Martin
patent: 1818974 (1931-08-01), Engelmann
patent: 2133509 (1938-10-01), Hall et al.
patent: 5262989 (1981-05-01), Waters
Henry Jon W.
Katsuma Kougakukikai Kabushikikaisha
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