Yes, the Lexar Professional CFexpress Type A Gold 256GB is compatible with the Sony Alpha A9 III.
Sony A9 III accepts CFexpress Type A in both combo slots. Lexar Gold Type A is VPG400 rated, meeting all A9 III recording formats including XAVC S-I 4K and S&Q Motion 4K (both require VPG200 minimum).
“This camera supports CFexpress Type A memory cards and SD memory cards (UHS-I, UHS-II compatible).”
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Confidence: inferred