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VILTROX C-AF 2XII Teleplus Auto Focus 2x Teleconverter Lens Extender Adapter for Canon EF Mount Telephoto Lens 135mm,200mm,400mm,600mm,70-200mm,100-400mm and DSLR Camera 5DII 6D 7D 80D 90D,White: Amazon.co.uk: Electronics & Photo
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Weather-resistant Fujifilm 2x teleconverter brings 1219mm focal length to X-Series: Digital Photography Review
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