B00CQG8O36 Canon EOS Rebel SL1 2x Teleconverter (4 Elements) + Nwv Direct Microfiber Cleaning Cloth.

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Doubles Focal Length of Lenses (4-Elements)
Multi-Coated Optical Glass with Anti-Reflection Coating
NOTE: Not compatible with Canon EF-S Lenses – Only EF Lenses) ** For The Same Extender which is applicable for the EF & EF-S Lenses – SEE ASIN: B081TNW121 **
Manufacturers’ Lifetime Warranty
Item Includes: Case, Protective Lens Cap, Nw Direct Micro Fiber Cleaning Cloth