Sigma has notified its customers that the NA-iTTL version of its EF-500 DG SUPER, EF-500 DG-ST and EM-140 DG flashguns will not work with the Nikon D40x.Sigma will provide free upgrades, and has apologized for any inconvenience customers may have experienced. All three flashguns will require an upgrade for use with the D40x. Customers are advised to contact the nearest authorized Sigma Service Station.
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