US Patent Issued to SIGMA on Sept. 1 for "Large aperture ratio telephoto zoom lens" (Japanese Inventor)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,724,248, issued on Sept. 1, was assigned to SIGMA Corp. (Kanagawa, Japan).

"Large aperture ratio telephoto zoom lens" was invented by Masakazu Hibino (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a large aperture ratio telephoto zoom lens with high optical performance, equipped with a vibration reduction system and a silent and speedy focusing mechanism and yet small and lightweight. The large aperture ratio telephoto zoom lens includes, sequentially from the object side to the image side: a first lens group G1 with positive refractive power, fixed relative to the image surface during zooming; a second lens group G2 with n...