US Patent Issued to Nikon on Oct. 21 for "Zoom optical system, optical apparatus and method for manufacturing the zoom optical system" (Japanese Inventor)

ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,645, issued on Oct. 21, was assigned to Nikon Corp. (Tokyo).

"Zoom optical system, optical apparatus and method for manufacturing the zoom optical system" was invented by Mami Muratani (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable magnification optical system (ZL) comprises a front group (GA) and a rear group (GB). The rear group (GB) has a first focusing lens group (GF1) and a second focusing lens group (GF2). From focusing on an object at infinity to focusing on a short-distance object, the front group (GA) is fixed with respect to an image surface, and the first focusing lens group (GF1) and the second focusing lens group (GF2)...