Sigma 120-400mm f4.5-5.6 APO DG OS Anyone? - PentaxForums.com

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04-16-2010, 06:27 AM	#1
bymy141 Veteran Member Join Date: Aug 2007 Photos: Gallery Posts: 1,563	Sigma 120-400mm f4.5-5.6 APO DG OS Anyone? Does somebody have experience with the new Sigma 120-400mm f4.5-5.6 APO DG OS? I've a few questions: - How does it hold at the long end, sharpness? - AF in low light with K-7, any experiences? - How effective is the Sigma OS compared to the in camera SR? I'm needing longer quality glass than my DA* 60-250mm.... Bert

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