Extend the reach of your existing Canon EF-mount lenses with this Autofocus 2x Teleconverter from Fotodiox. This converter doubles the effective focal length of your lens, turning a 50mm lens into a 100mm optic for example. It also maintains communication between the lens and camera and uses multi-coated optics to limit ghosting and flares. Additionally, the four element design ensures sharp imagery. This converter is compatible with EF/EF-S-mount camera bodies and with most EF-mount lenses. To ensure autofocus compatibility, confirm your camera's AF sensitivity will support the two stop reduction in light.