patent
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Patent application for 400mm f4, 500 f5.6, 600mm f5.6 and 800 f6.3 tele-lenses
Asobinet has uncovered a patent application P2024163673 for various tele-lenses: 400mm f4 500mm f5.6 600mm f5.6 and f6.3 800mm f6.3 Link to google translated post.