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Das neue Sigma SIGMA 17-50mm F2.8 EX DC OS HSM kommt bald
die Konkurrenz zu Tamron 17-50mm 2,8f VC
http://www.dpreview.com/news/1002/10022014sigma17mm50mm.asp
die Konkurrenz zu Tamron 17-50mm 2,8f VC
http://www.dpreview.com/news/1002/10022014sigma17mm50mm.asp