Sigma 70-200mm f/2.8 EX DG APO OS HSM for Nikon - Walmart.com
Hood Adapter HA680-01 258 | SIGMA Corporation of America
Sigma Lens Hood Adapter for 105mm f/2.8 EX DG OS HSM HA680-01
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Original Sigma HA850-01 APS-C Hood Adapter for 70-200mm f/2.8 EX DG OS HSM Lens 85126927332 | eBay
Amazon.com : Fotodiox Pro Lens Mount Adapter - Canon EOS (EF, EF-s) Lens to Sony E-Mount Camera (APS-C & Full Frame Such as NEX-5, NEX-7 & α7) : Electronics