ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,794, issued on Sept. 16, was assigned to TAMRON Co. LTD. (Saitama, Japan).
"Optical system and imaging apparatus" was invented by Tomohiro Kobayashi (Saitama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The optical system includes a plurality of lens groups in which an interval between adjacent lens groups changes when focusing, and an aperture stop, and when intervals between an exit pupil of an on-axis ray by the aperture stop and an image plane in an infinite-distance object focusing state, a first short-distance object focusing state in which an imaging magnification is Beta1, and a second short-distance object focusing state in which ...