Carefully positioned lens release mechanism makes it easy to mount the extender quickly, reducing the time the camera and lens are exposed to the environment.

Integrated processor communicates between camera and lens and ensures all focusing, metering and ID information is available.

All optical elements use Canon's Super Spectra coating, reducing ghosting and flare.

Fluorine Coating on the front and rear elements keeps soiling, smears, and fingerprints to a minimum.

Sealed to be resistant to both dust and water, allowing photographers to use them in extreme shooting conditions.

Compatible Lenses

Fixed focal length L-series lenses 135mm and over

All versions of the EF 70-200mm f/2.8L, EF 70-200mm f/2.8L IS, and EF 70-200mm f/4L

EF 100-400mm f/4.5-5.6L