Teleconverter extender camera fitting canon ef magnification 2 x suitable for camera type canon for camera series canon eos for lens series canon ef lens mount canon ef thread diameter 68 mm area of use animal photography sports photography astrophotography aperture range 28 32 lens construction groupselements 56 coatings anti reflective coating sml lens diameter 68 mm length 45 mm weight 240 g colour black included in delivery case rea