Canon Extender EF 2X III

Canon Extender EF 2X III Type: Converters & Adapters Camera Mount: Canon EF Compatibility: This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Magnification: 2.0x Lens Construction: 9 elements in 5 groups Specifications: Dust and water resistant Dimensions: 2.8 x 2.1 in Weight: 11.5 oz.