Patents were found for a Sigma 200mm F2 OS and a Sigma 300mm F2.8 OS. overview [Publication number] P2025162727 [Release date] 2025-10-28 [Title of Invention] Imaging optical system [Application date] 2024-04-16 [Applicant] [Identification number] 000131326 [Name or company name] Sigma Corporation An imaging optical system is provided that is lightweight, has excellent correction for longitudinal […]