FOCUS FOCUS OBJETIVO ANILLO DE CAMBO SIGMA 17-50 mm F2.8 EX DC OS HSM AG1208. Ring Focus Sigma 17-50 mm F2.8 EX DC OS HSM. Lente Foco Goma Anillo Sigma 17-70MM F2, 8-4, 0 Dc Macro HSM AG1212. Lente Zoom Goma Anillo Sigma 17-70MM F2, 8-4, 0 Dc Macro HSM AG1211.
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