B002Z40IEC Vivitar Digital Canon EF-S 55-250mm f/4-5.6 is 2X Teleconverter (4 Elements) + Nwv Direct Microfiber Cleaning Cloth.

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