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Canon Extender EF 2X III

BH #CA2XEF3 • MFR #4410B002
Canon Extender EF 2X III
Key Features
  • EF Mount Teleconverter
  • 2.0x Magnification Factor
  • Microcomputer Controlled
  • Communication Between Lens & Camera
The Extender EF 2X III from Canon is designed for select Canon EF mount L-series telephoto lenses. It increases the focal length of a lens by a factor of 2x while still delivering superb image quality. To ensure the best possible image quality in all shooting conditions, it combines redesigned optics, improved data communication between lens and camera and enhanced environmental protection. It is ideal for photojournalists and wildlife, nature and sports photographers who need to get close to distant and challenging subjects and it reduces the need to carry heavy telephoto lenses.
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Canon EF 2X III Overview

The Extender EF 2X III from Canon is designed for select Canon EF mount L-series telephoto lenses. It increases the focal length of a lens by a factor of 2x while still delivering superb image quality. To ensure the best possible image quality in all shooting conditions, it combines redesigned optics, improved data communication between lens and camera and enhanced environmental protection. It is ideal for photojournalists and wildlife, nature and sports photographers who need to get close to distant and challenging subjects and it reduces the need to carry heavy telephoto lenses.

The Extender EF 2x III features nine optical elements in five groups, ensuring improved optical performance. All optical elements have Canon's Super Spectra coating to reduce ghosting and flare. 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 balanced, well-exposed images. When combined with the latest range of premium Canon L-series lenses, these extenders enable AF accuracy even when capturing moving subjects. When attached, the 2x extender reduces the effective maximum aperture by 2 stops.

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.

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
UPC: 013803122152

Canon EF 2X III Specs

MountCanon EF
Magnification2x
Optical Design9 Elements in 5 Groups
Light Loss2 Stop
Length2.1" / 52.7 mm
Diameter2.8" / 72 mm
Weight11.5 oz / 325 g
Packaging Info
Package Weight0.99 lb
Box Dimensions (LxWxH)5.3 x 3.75 x 3.7"

Canon EF 2X III Reviews

ef 2x lll

By Larry
Rated 5 out of 5
Date: 2022-02-03

I use this extender with my 100-400mm and love the new reach. I am able to get sharp images even in handheld situations.

Works great with my 300

By Tom
Rated 5 out of 5
Date: 2022-01-27

I call it my poor man's 420 and 600. I use the 1.4 for football games giving me 420mm and sometimes I get a chance to shoot wildlife. Thanks to this extender I get a 600mm lens. Is it as sharp as a prime 600, I'm sure not, but suits my purposes very well at a fraction of the cost! My 300 prime can be that, or a 420 or a 600. Works for me!

Happy with my purchase

By double g images
Rated 4 out of 5
Date: 2021-09-28

Sharp image. Minor complaint is that I didn't consider that I wouldn't be able to open up my 70-200 to 2.8 with the extender on. Other than this miscalculation on my part I'm pleased with this piece of equipment.

EF 2.0x and 1.4x Extenders are really first class

By David
Rated 5 out of 5
Date: 2021-09-03

I waited three months for this on backorder, and it finally came - in perfect condition as always from B&H. Haven't used it a great deal yet, but did test it out along with its little brother the EF 1.4X III purchased at the same time but received three months earlier. On a partly cloudy/bright day I took a photo with my EF 70-200 f/2.8L IS USM III mounted on my 80D. Then I took the same photo from the same location with the addition of the 1.4 Extender. Finally I took the same photo with the 2.0 Extender replacing the 1.4. All were hand held with my elbows supported on a firm surface. The pictures were extremely good. Sharp focus with no noticeable blur. Auto-focus in every case was quick with no hunting. Focus slowdown with the two extenders was not easily discerned.= if any at all. I took the. following precautions. Turn off the camera when changing the lens and/or the extenders. Always mounting the extender to the lens first, and then the combo to the camera. Removal in reverse order. I think I understand the logic of Canon recommending this method of installing and removing the extenders. My son tried the same thing with his T6S and his 70-200 zoom. He took photos at night in his normally lighted kitchen, hand held also. Again no noticeable focusing delay. We were impressed with the clarity of the photos. Now this was hardly an exhaustive and rigorous test of the extenders, but did show that casual but careful use of the extenders can produce excellent results. Thanks to the 1.6 crop of our APS-C bodies we were able to achieve 640mm for a lot less than buying a 400mm lens. I am sure we will experience incidences of less than satisfactory results at times, but properly used the Canon Extenders are top notch.

great product

By jmureg
Rated 5 out of 5
Date: 2021-08-06

great photo results. A lot of focus points are supported through this extender for the 70-200ii

A very powerful tool!

By Jose
Rated 5 out of 5
Date: 2021-07-19

Some photos from my San Francisco trip. Every picture is protected/Copyrights. The extender works 100%. If you want to use this photos, please contact me.

Excellent addition

By Stephen
Rated 5 out of 5
Date: 2022-02-02

This is a definite must have in a camera bag. I have a telephoto that I thought would do what I wanted. For the most part it does but when I needed more it was disappointing. The 2X extender makes the lenses even better. Quality is second to none lick all Canon products. B&H guided me with answers to my questions and even suggested this extender. Thank you it is exactly what I needed.

Cannot Use Autofocus

By Janet
Rated 2 out of 5
Date: 2022-02-01

You cannot use autofocus with my lens.

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question

How does it works with the 24-70 f/2.8 and with the macro 100 f/2.8?
Asked by: Anisa R.
The Extender EF 2X III does not work with the 24-70 f/2.8 or the 100 f/2.8 macro. The shortest lens you can use this extender on is the 135 f/2.0.
Answered by: Tim D.
Date published: 2018-08-28

question

Will this extender work with a Canon 5D Marc III, using the Canon 70-200mm f/4L IS USM lens in Auto Focus or will this be a manual focus only option. How much clarity, if any, will be lost.
Asked by: Anonymous
Unfortunately, you will lose autofocus using the Canon 2x EF Extender III with the 70-200mm f/4L IS on the 5D III. The extender will have an impact on the image quality you are used to getting from the lens, but the quality will be noticeably better than cropping the image.
Answered by: Christina S.
Date published: 2018-08-28

Will it work with a EF 70-200 f/2.8L IS III USM ...

Will it work with a EF 70-200 f/2.8L IS III USM on a 90D?
Asked by: Yo
While I don't have exact experience with your mentioned setup, I have used this extender with the EF 70-200 f/2.8L IS II (one version older) on both an 80D and 5D Mark IV. It works fine on both, aside from losing some speed/image quality that normally comes with extenders.
Answered by: Anonymous
Date published: 2020-02-07

Will it work on Canon 70-200 f/4 IS II?

Will it work on Canon 70-200 f/4 IS II?
Asked by: L. C.
This combination will mount together , you will lose 2 stops of light with that you will also lose autofocus , unless if you have 5d4 ore 1dx2/3 and 7d2
Answered by: vilson
Date published: 2021-02-02

What is the best extender compatible with sigma ...

What is the best extender compatible with sigma lenses
Asked by: Samantha
Sorry, only use Canon.
Answered by: Dave
Date published: 2020-03-18

Has anyone used this lens for videography? I use ...

Has anyone used this lens for videography? I use a c100 and a 70x200 f4 L. Are the results acceptable? Any negatives?
Asked by: Gary
This teleconverter generally works best with a sufficient amount of light present in the scene.
Answered by: Kirk
Date published: 2020-07-29

question

Will the 2x auto-focus with a 70D body and 100-400L telephoto?Can you also confirm that the 1.4x will do so, as I read on the Q&A for that product?
Asked by: Anonymous
The 2x converter will cause the lens to be too dark for the 70D to autofocus as will the 1.4x converter.
Answered by: Yos O.
Date published: 2018-08-28

question

Hello there,Does it work with 5D MarkII and:EF 28-300mm f/3.5-5.6L IS USM EF 24-70mm f/2.8L II USM EF 24-105mm f/4L IS USM EF 50mm f/1.2L USM
Asked by: Anonymous
No it does not. This converter is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Zoom lenses whose widest focals are less than 70mm are not compatible with any teleconverters due to their construction.
Answered by: Yos O.
Date published: 2018-08-28
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