US Patent Issued to Nikon on Aug. 26 for "Optical system, optical apparatus and method for manufacturing the optical system" (Japanese Inventors)

ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,399,353, issued on Aug. 26, was assigned to Nikon Corp. (Tokyo).

"Optical system, optical apparatus and method for manufacturing the optical system" was invented by Masashi Yamashita (Tokyo) and Akino Kondo (Yokohama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "This optical system (OL) has a first lens group (G1) having positive refractory power, a second lens group (G2), a third lens group (G3), and a fourth lens group (G4) which are aligned in order from an object side along an optical axis, wherein when focused from an infinity object to a short-distance object, the second lens group (G2) and the third lens group (G3) move in mutually differ...