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Vello Tripod Mount Ring A Black (TC-AB) (for Canon 70-200 F/4 L, 300 F/4L, 400 F5.6L USM) at KEH Camera
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Metal 71mm Tripod Mount Ring Lens Collar for Sigma 70mm f/2.8 DG Macro Art Lens of Canon EF, Sigma SA, Sony E and L Mount - AliExpress Consumer Electronics
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VELLO Tripod Collar a (black) for Canon 200mm F/2.8 70-200mm & 400mm F/5.6 Lenses for sale online | eBay
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Vello Tripod Mount Ring A White (TC-AW) (for Canon 70-200 F/4 L, 300 F/4L, 400 F5.6L USM) at KEH Camera
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