B00W35PAFA Canon EF 50mm f/1.2L USM 2x Teleconverter (4 Elements) + Nw Direct Microfiber Cleaning Cloth.

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4-elements
Multi-coated Optical Glass with anti-reflection coating
Doubles focal length of lenses
Manufacturers’ Lifetime Warranty
Item Includes: Case, Protective Lens Cap, Nw Direct Micro Fiber Cleaning Cloth