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Sigma 30mm F2.8 ART Emount
有盒有單有保
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Review of the Sigma Lens
https://www.youtube.com/watch?v=CPP25IFKawM
http://www.stevehuffphoto.com/2012/09/26/the-199-sigma-30-f2-8-real-world-lens-review-on-the-sony-nex-7-bang-for-the-buck-of-the-year/