Warning!  This extender does not work with every Canon Lens.  See compatibility chart below.  You will lose 1 f/stop with this extender.

The Canon 1.4x EF Extender III is designed for Canon L-series telephoto lenses. The extender is perfect for photojournalists, nature and sports photographers who need to get close to distant and challenging subjects. The 1.4x EF Extender III increases the focal length of a lens by a factor of 1.4x while still delivering superb image quality. To ensure the best possible image quality in all shooting conditions, it also combines enhanced environmental protection, redesigned optics and improved data communication between lens and camera.

The extender allows professional photographers to shoot distant subjects without having to carry a number of heavy lenses. The 1.4x EF Extender III features three groups of seven elements, ensuring improved optical performance. All optical elements use Canon's Super Spectra coating, reducing ghosting and flare to minimize 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, these extenders enable higher AF accuracy, ensuring perfectly sharp shots, even when capturing moving subjects.

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 extenders offer the exceptional build-quality expected from Canon's professional products, and are resistant to both dust and water, allowing photographers to use them in extreme shooting conditions.

Note: This teleconverter will only fit and work with a select list of lenses. Please see below for compatibility chart of all compatible lenses.

Designed for Canon L-series telephoto lenses

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 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 makes marks, such as spots left by water or fingerprints, much easier to clean

Resistant to both dust and water, allowing photographers to use them in extreme shooting conditions

Extender EF 1.4x Compatibility Chart
Lens Attachment	Focal Length (mm)	f-stop (f)	Max. Magnification (x)	AF
EF 135mm f/2L USM	189	2.8 ~ 45	0.27	O
EF 180mm f/3.5L Macro USM	252	4.5*1 ~ 45	1.40	O*3
EF 200mm f/1.8L USM	280	2.5 ~ 32	0.12	O
EF 200mm f/2L IS USM	280	2.8 ~ 45	0.18	O
EF 200mm f/2.8L II USM	280	4 ~ 32	0.22	O
EF 300mm f/2.8L IS USM	420	4 ~ 45	0.15	O
EF 300mm f/4L IS USM	420	5.6 ~ 45	0.33	O
EF 400mm f/2.8L IS USM	560	4 ~ 45	0.22	O
EF 400mm f/4L DO IS USM	560	5.6 ~ 45	0.17	O
EF 400mm f/5.6L USM	560	8 ~ 45	0.18	X*4
EF 500mm f/4L IS USM	700	5.6 ~ 64	0.17	O
EF 600mm f/4L IS USM	840	5.6 ~ 64	0.17	O
EF 800mm f/5.6L IS USM	1,120	8 ~ 45	0.2	X
EF 1200mm f/5.6L USM	1,680	8 ~ 45	0.12	X
EF 70-200mm f/2.8L USM	98 ~ 280	4 ~ 45	0.22	O*2
EF 70-200mm f/2.8L IS USM	98 ~ 280	4 ~ 45	0.24	O
EF 70-200mm f/2.8L IS II USM	98 ~ 280	4 ~ 45	0.24	O
EF 70-200mm f/4L USM	98 ~ 280	5.6 ~ 45	0.31	O
EF 70-200mm f/4L IS USM	98 ~ 280	5.6 ~ 45	0.31	O
EF 100-400mm f/4.5-5.6L IS USM	140 ~ 560	6.7 ~ 54*1	0.28	X*4*5
(O =possible X =impossible)

*1	Data based on EOS models with exposures displayed in 1/2 stop increments. It varies slightly with the EOS-1v, EOS-1N, EOS-1 and EOS-3.
*2	If the EF 70-200mm f/2.8L USM lens is attached to an EOS camera having multiple focusing points and an Extender is attached to the lens, only the center focusing point will be usable for AF.
*3	The autofocusing range is from 0.8m/2.6ft. to infinity.
*4	With the EOS-1D series, EOS-1v and EOS-3, AF is possible, but with the center focusing point only.
*5	The Image Stabilizer does not operate with the following cameras: EOS 650, 620, 630/600, RT, 700, 750, 850, EOS-1, A2/A2E, 10s, Elan, Rebel/Rebel S, Rebel II/Rebel SII.