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"RE: Compatability question"
The D7000 had compatibility issues with a few Sigma lenses, mainly LiveView functionality.If your lens has the firmware for the D7000, it will likely work fine on the D7100.My Sigma: 8-16mm; 50/1.4 (firmware updated for D7000); 150/2.8 (firmware updated for D7000), work flawlessly on the D7100.A late manufacture Sigma is likely to have all necessary firmware loaded in the lens.