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Atoll tripod collar makes camera angle adjustment a breeze, no matter your gear: Digital Photography Review
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JJC Durable Tripod Mount Ring Lens Collar Compatible with Canon EF 70-200mm f/4L is II USM, EF 70-200mm f/4L and EF 70-200mm f/4L is Lens Replaces Canon A-2 AII Tripod Mount Ring
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