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Amazon.com : iShoot Tripod Mount Ring Base, Lens Collar Foot Support Stand Compatible with Canon RF 600mm F11 IS STM and Canon RF 800mm F11 IS STM, Lens Holder with 39mm Arca-Swiss
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Amazon.com : Lens Collar Support Tripod Mount Ring for Nikon RT-1 Nikkor AF-S 300mm F/4E PF ED VR and AF-S 70-200mm F/4G ED VR-Bottom Quick Release Plate Feature Compatible with ARCA-Swiss 39mm
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