(under subclass 399) Subject matter wherein the telescope continuously varies the size of the image while the object distance remains constant.
(1) Note. Other subclasses in this class indented under subclass 407, Binocular, and titled "Separation of optical elements axially adjustable" may include subject matter related to variable magnification.
SEE OR SEARCH THIS CLASS, SUBCLASS:
380, for a microscope with variable magnification.
432, for a compound lens system with variable magnification.
506, for adjustable extended spacing structure for optical elements.
676+, for a lens having its equivalent focal length variable continously between limits.
