Sigma patent filings for a Sigma 400-800mm f/8 and Sigma 180-800mm f/5.8-8.4 were found and you can read them below: overview [Publication number] P2025085984 [Release date] 2025-06-06 [Name of invention] Telephoto zoom lens [Application date] 2023-11-27 [Applicant] [Identification number] 000131326 [Name or company name] Sigma Corporation To provide a telephoto zoom lens that reduces the […]
