The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2026
Filed:
Aug. 28, 2024
Sigma Corporation, Kanagawa, JP;
Masakazu Hibino, Kanagawa, JP;
SIGMA CORPORATION, Kanagawa, JP;
Abstract
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 Gwith positive refractive power, fixed relative to the image surface during zooming; a second lens group Gwith negative refractive power; a third lens group Gwith negative refractive power; a fourth lens group Gwith positive refractive power; an aperture diaphragm S; and a subsequent lens group GR composed of a plurality of lens groups. Distances between adjacent lens groups change during zooming from the wide-angle end to the telephoto end. The subsequent lens group GR includes a focusing lens group that moves during focusing from an infinite distance object to a close distance object.