Canon EF Extender 2 X III Teleconverter

 
Canon EF 2.0X III Telephoto Extender for Canon Super Telephoto Lenses

Compatibility: EF 600mm f/4L IS USM, EF 400mm f/2.8L IS III USM, EF 600mm f/4L IS III USM, EF 800mm f/5.6L IS USM, EF 500mm f/4L IS II USM, EF 500mm f/4L IS USM, EF 400mm f/5.6L USM, EF 400mm f/4 DO IS II USM, EF 400mm f/4 DO IS USM, EF 600mm f/4L IS II USM, EF 135mm f/2L USM, EF 300mm f/2.8L IS II USM, EF 300mm f/4L IS USM, EF 200mm f/2L IS USM, EF 200mm f/2.8L II USM, EF 300mm f/2.8L IS USM, EF 400mm f/2.8L IS USM, EF 400mm f/2.8L IS II USM, EF 180mm f/3.5L Macro USM, EF 70–200mm f/2.8L IS II USM, EF 70–200mm f/2.8L IS III USM, EF 70–200mm f/2.8L USM, EF 70–200mm f/4L IS USM, EF 70–200mm f/4L IS II USM, EF 70–200mm f/4L USM, EF 100–400mm f/4.5 – 5.6L IS II USM, EF 100–400mm f/4.5 – 5.6L IS USM, EF 200–400mm f/4L IS USM, Extender 1.4x