Amazon.com : Extender EF 1.4X III Lens : Digital Cameras : Electronics
Amazon.com : Sigma TC-1401 1.4X Teleconverter for Canon EF Bundle Includes Flexible Tripod, Soft Carry Case, and 6Ave Cleaning Kit : Electronics
Amazon.com : Tamron AF 1.4x Teleconverter for Canon Mount Lenses (020FCA) : Camera Power Adapters : Electronics
Amazon.com : Kenko Teleplus 1.4X HD Pro DGX Teleconverter for Canon EF Mount - Black (62526) : Electronics
Amazon.com : VILTROX C-AF 2X II TELEPLUS 2.0X Teleconverter Auto Focus Telephoto Extender Lens Converter for Canon EF Mount Super Telephoto Lens 70-200mm 100-400mm and DSLR Camera 80D 5DII : Electronics
Amazon.com : Canon Extender RF 2X (4114C002) + Cap Keeper + Cleaning Kit + More (Renewed) : Electronics