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Canon Tripod Mount Ring A II (W) for 70-200mm f/4L Lenses Review
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Amazon.com : Canon Replacement Tripod Mount Ring A II for EF 70-200mm f/4L USM, White Finish : Tripod Lens Mount Rings : Electronics
Used Canon Tripod Mount Ring A II for 70-200mm f/4L 1695B001 B&H
