PENTAX Sigma APO DG OS 50 - 500mm F4.5-6.3 AF LENS 50-500 mm f/4.5-6-3
File:Sigma 50-500mm f4-6.3.jpg - Wikipedia
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Bought a Bigma (Sigma 50-500mm) for 4/3. Now I need an adaptor to go from 4/3 to M4/3 so I can use it on my OM-D bodies. Anyone have a MMF-3 or
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Sigma 50-500mm f4-6.3 EX DG/HSM lens: Digital Photography Review
