US Patent Issued to Nikon on Nov. 18 for "Variable magnification optical system, optical apparatus, and method for producing variable magnification optical system" (Japanese Inventor)

ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,474,554, issued on Nov. 18, was assigned to Nikon Corp. (Tokyo).

"Variable magnification optical system, optical apparatus, and method for producing variable magnification optical system" was invented by Kosuke Machida (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable magnification optical system comprising a plurality of lens groups and, upon varying a magnification, distances between respective lens groups in the plurality of lens groups being varied. The plurality of lens groups comprises an object side focusing lens group which is moved upon carrying out focusing and at least one image side focusing lens group disposed in a more image...