Lens support for Sigma 18-35 f/1.8, Olympus 12-100 and 75-300: Micro Four Thirds Talk Forum: Digital Photography Review
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Amazon.com : Tripod Mount Ring Lens Collar Support for Sigma 135mm f/1.8 DG HSM Art Lens(for Canon EF and Nikon F Mount), Built-in Arca-Swiss Type Quick Release Plate for Tripod Ball Head :
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