US PATENT SUBCLASS 359 / 680
.~.~ Reverse telephoto

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

642  DF  LENS {32}
676  DF  .~ With variable magnification (e.g., zoom type ) {6}
680.~.~ Reverse telephoto {2}
681  DF  .~.~.~> Having eight or nine components
682  DF  .~.~.~> Having seven or less components

DEFINITION

Classification: 359/680

Reverse telephoto:

(under subclass 676) Subject matter wherein the lens includes a negative group on the longer conjugate side and a positive group on the shorter conjugate side with the spacing between these groups being varied to vary the overall focal length of the combination.

(1) Note. See subclasses 749+ for reverse telephoto lenses that are not of variable focal length.