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Sigma 400mm F5.6 APO HSM Launched September 1996 – Sigma UK
Sigma / Carl Zeiss Jena (AF and MF) IF MC multic 400mm F5.6 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
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Sigma 400MM APO f/5.6 Telephoto Lens for Canon AF 85126900953 | eBay
