Sony 400mm f/2.8 FE: B&H Photo / Amazon/ Adorama Patents have been filed for a Sony 800mm f/5.6 and a Sony 400mm f/4 that were filed alongside the Sony 400mm f/2.8 and 500mm f/4. You can check them out below. overview [Publication number] P2025063175 [Release date] 2025-04-15 [Title of invention] Optical system and imaging device [Application date] 2025-01-14 [Show […]