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Canon Tripod Mount Ring D (B) (for 100mm F/2.8L Macro Lens) | Digital SLR Camera, Digital Cameras, Toronto Canada Digital Camera Store, Aden Camera
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Amazon.com : iShoot 78mm Tripod Mount Ring B(W) Lens Collar Support for Canon EF 70-200mm f/2.8L USM/is USM/is II USM/III USM, EF 100-400mm f/4.5-5.6L is USM, EF 35-350mm f/3.5-5.6L USM, EF 300mm
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Canon Tripod Mount Ring B(W) for Canon 70-200mm f/2.8L, 70-200mm f/2.8L IS, 300mm f/4L, 35-350mm f/3.5-5.6L Lens at KEH Camera
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Amazon.com : JJC Tripod Collar Mount Ring, Compatible with Canon EF 70-200mm f/4L /EF 70-200mm f/4L is/EF 70-200mm f/4L is II USM Lens, Replaces Tripod Ring A-2 : Tripod Lens Mount Rings :
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