Canon EF 2.0X III Telephoto Extender for Canon Super Telephoto Lenses
$429.00Compatible with Select EF Mount Lenses. Note: 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
2.0x magnification factor
9 elements in 5 groups lens construction