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![Repairing a Sigma 24-70 EX Lens | [protofusion]](http://protofusion.org/wordpress/wp-content/uploads/2011/10/zoomportion.jpg "Repairing a Sigma 24-70 EX Lens | [protofusion]")
Repairing a Sigma 24-70 EX Lens | [protofusion]
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Sigma 18-200mm f/3.5-6.3 DC disassembly for repairing zooming and autofocus problems - YouTube
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