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Factron offers the Quattro for iPhone SP, an iPhone case with a lens mount for different lenses. The case is made of aluminum alloy with a metallic gloss, polished finish. Users can buy additional lens for the case, like fish-eye, wide angle, macro lens. 

The Quattro for iPhone SP is priced at 19,600 Yen and the lens costs 1700-5300 Yen. The current version works with iPhone 3G only, iPhone 3GS version will be released later.