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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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