Allowing professional photographers to shoot distant subjects without having to carry a number of heavy lenses with them, this new extender ensures there is no compromise on image quality. The Extender EF 2x III features three groups of nine elements, ensuring improved optical performance. All optical elements use Canon’s Super Spectra coating, reducing ghosting and flare to minimise post-processing requirements. A new Fluorine Coating on the front and rear elements makes marks, such as spots left by water or fingerprints, much easier to clean than standard coatings.

To facilitate the accurate transfer of imaging data between the lens and camera body, the extender features an integrated processor which ensures all focusing, metering and ID information is available – allowing the photographer to capture crisp, well-exposed images. When combined with the latest range of premium Canon L-series lenses, this extender enables higher AF accuracy compared to previous generations, ensuring professionals achieve perfectly sharp shots, even when capturing moving subjects.

The Extender EF 2x III have been designed to complement the latest range of L-series lenses, matching their appearance and offering a visible differentiation from previous models. A carefully positioned lens release mechanism also makes it easy to mount the extenders quickly, reducing the time that the camera and lens are exposed to the environment. The extender offers the exceptional build-quality expected from Canon’s professional products, and is resistant to both dust and water, allowing photographers to use it in extreme shooting conditions.

Note:

The following list of discontinued lenses fitting these parameters are compatible, but may require camera microfocus calibration for accurate focusing (note that not all DSLR cameras support microfocus calibration):

Canon EF 200mm f/1.8 L USM Lens
Canon EF 300mm f/2.8 L USM Lens (non-IS)
Canon EF 400mm f/2.8 L USM Lens (non-IS)
Canon EF 400mm f/2.8 L II USM Lens (non-IS)
Canon EF 500mm f/4.5 L USM Lens
Canon EF 1200mm f/5.6 L USM Lens

Due to having incompatible signal relay systems, film SLRs are not compatible with the Series III Extenders (with the EOS-1V being the only exception).