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Canon announces EF Extender 1.4x III and EF Extender 2x III

By dpreview staff on Aug 26, 2010 at 04:00 GMT
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Canon has updated its 1.4x and 2x 'Extender' teleconverters, to version III. The EF Extender 1.4x III and EF Extender 2x III both offer completely new optical designs, weather resistant construction, Fluorine coatings on the front and rear elements, and promise higher AF accuracy than the previous versions. They also include redesigned lens release mechanisms and integrated processors for improved communication between the camera and lens.

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Press Release:

Extend the reach of your telephoto lens with Canon’s Extender EF 1.4x III and Extender EF 2x II

London, 26th August 2010 – Canon today unveils two lens extenders designed for its L-series range of new super-telephoto lenses. Designed for photojournalists, nature and sports photographers who need to get close to distant and challenging subjects, the Extender EF 1.4x III and Extender EF 2x III increase the focal length of a lens by a factor of 1.4x and 2x respectively while still delivering superb image quality. To ensure the best possible image quality in all shooting conditions, they also combine enhanced environmental protection, redesigned optics and improved data communication between lens and camera.

Canon professional image quality

Allowing professional photographers to shoot distant subjects without having to carry a number of heavy lenses with them, these new extenders ensure there is no compromise on image quality.  The Extender EF 1.4x III features three lens groups of seven elements, and 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, both models feature 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 compared to previous generations, ensuring professionals achieve perfectly sharp shots, even when capturing moving subjects.

Redesigned for high performance
The Extender EF 1.4x III and 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 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.

For convenient transport, the 225g Extender EF 1.4x III and 325g Extender EF 2x III are supplied with a soft case (LP811) and Extender Cap EII.

Canon Extender EF 1.4x III and Extender EF 2x III specifications

  Extender EF 2x III Extender EF 1.4x III
Lens Construction 9 elements/5 groups 7 elements/3 groups
Dust/moisture resistance Yes
Supplied accessories • Extender Cap EII
• LP811 lens case
Weight 325 g 225 g
Dimensions 72 mm diameter x 53 mm length 72 mm diameter x 27 mm length

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Canon Extender EF 2x III


Total comments: 3
By drchevalier (Sep 10, 2012)

I owned the II 2x before it was stolen and replaced it with the III. With the 70-200/2.8 there is a discernable difference in IQ with the III being superior. If find the colour to be more accurate in the III. Moreover, sharpness and distortion control is better in the corners with the III over the II. While there is a price differential at MSRP, all things being equal, I believe it is worth the difference to spend for the III generation.

By Takahashi (Dec 24, 2011)

Paul, I found this (limited) test, but the tester seems unconvinced of any marked improvement between the mkII and mkIII :

He admits he hasn't conducted any in-depth tests, and while he says he can discern no great difference, I can see a clear change in colour depth, in favour of the markII, but that may be either coincidental or due to other factors such as post-processing.

Comment edited 34 seconds after posting
paul wassermann
By paul wassermann (Dec 13, 2011)

has anyone tested version III vs II for these extenders? Any real differences to justify the price?

Total comments: 3