US Patent Issued to Nikon on Sept. 1 for "Zoom optical system, optical apparatus, imaging apparatus and method for manufacturing the zoom optical system" (Japanese Inventor)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,724,251, issued on Sept. 1, was assigned to Nikon Corp. (Tokyo).

"Zoom optical system, optical apparatus, imaging apparatus and method for manufacturing the zoom optical system" was invented by Kosuke Machida (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A zoom optical system comprises, in order from an object: a front lens group (GFS) having a positive refractive power; an M1 lens group (GM1) having a negative refractive power; an M2 lens group (GM2) having a positive refractive power; and an RN lens group (GRN) having a negative refractive power, wherein upon zooming, distances between the front lens group and the M1 lens group, between the M1...