Variable magnification observation optical device

Details Variable magnification observation optical device Variable magnification observation optical device

1983-11-07

1985-10-22

Henry, Jon W.

350518, 350556, G02B 704, G02B 2100, G02B 2300

Patent

active

045484813

ABSTRACT:
A variable magnification observation optical device comprises an objective lens, an eyepiece disposed rearwardly of the objective lens, a magnification changing lens disposed between the objective lens and the eyepiece, a support member for supporting the magnification changing lens so that the principal point thereof can be changed from one to the other of the objective lens side position and the eyepiece side position relative to an object image formed between the objective lens and the eyepiece by the objective lens, the support member having a field stop for at least one of a state in which the principal point of the magnification changing lens is positioned on the objective lens side and a state in which the principal point of the magnification changing lens is positioned on the eyepiece side, and change-over means for moving the support member to change the principal point of the magnification changing lens from said one position to said other position, thereby changing over the magnification of the optical device.

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