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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 Extender 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 Extender 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 Extender EF 2x III Reviews

Double the fun!

By Mark
Rated 5 out of 5
Date: 2022-09-16

You lose a couple of stops of light (from 2.8 to 5.6) on a 70-200 but who's counting? I didn't have to fork out $5,000 for a 400mm 2.8 right? Be careful as it doesn't fit ALL L canon lenses but it works a treat on the EF lens adaptor on my R3 even though the whole caboodle is getting a bit long with all the extenders and adaptors!

Great Extender

By Charles
Rated 5 out of 5
Date: 2022-08-05

Have only had the opportunity to use it once but it turned my EF 100-400 into a 200-800. Loved the outcome even if it did drop me down to f11 on my Eos R6. Great!!!!

The Canon 2X III Converter

By Saad
Rated 3 out of 5
Date: 2022-07-01

Auto focus does not work with this extender if it is mounted with a 100-400mm on a non- mirrorless canon. Even when used with R5 mirrorless camera, auto focus is very very slow and frustrating. It is not as good as the 1.4 extender. It' disappointing.

A great with Canon EF 70-200mm f/2.8L IS III USM Lens

By Hiroko
Rated 5 out of 5
Date: 2022-06-30

I was waiting for Canon Extender EF 2X III for a long while. I am very happy with it to extend the zoom to 400 mm on my Canon EF 70-200mm f/2.8L IS III USM lens which is the best lens I have. Lately I have been photographing Hawks, Hummingbirds and etc and find this Canon Extender EF 2X III gives me the ability to photograph at 400mm without purchasing another Canon lenses. With this Extender EF 2X III, the maximum aperture is smaller by 2 stops (f/5.6 for my lens). With Canon EOS 5D Mark III body, Canon EF 70-200mm f/2.8L IS III USM Lens and Canon Extender EF 2X III, it weights about 6.4 pounds which is a little heavy but manageable. Overall, I am glad I purchased this 2X Extender.

Extender EF 2x III

By ZUrban
Rated 5 out of 5
Date: 2022-06-30

Extender EF 2x III Is exactly what I needed to extend the range of my EF 300mm f2.8 lens. Auto focus works as it should although at slower response. That delay has impacted by sports photography but not my nature photography. As always, Canon did a great job thought the order process and shipping. I am very satisfied.

Works but can't crop in post.

By Greg
Rated 3 out of 5
Date: 2022-06-29

Gives a nice extension on your glass but it dulls the image. Might be better off not using and cropping in post. I find the 1x4 works better but still slightly soft.

Very nice. Quite sharp.

By Dave
Rated 5 out of 5
Date: 2022-09-12

I've tested this Canon EF 2x extender lll with both my Canon 70-200mm L series lens and a Sigma 150-600mm DG contemporary lens. The image stays effectively sharp. There is definitely a little loss of clarity, but its not enough to stop me from using it at any given time. I'm quite happy with it.

Better than the last time I tried one

By Ronald
Rated 4 out of 5
Date: 2022-09-07

The last time I tried a 2X I was unhappy with the results with my 500mm f4. I had heard from a friend that he went through three of them before he found one that produced acceptable results. So I guess not all teleconverters are made equal.

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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 this work with the Canon RF 100-400mm ...

will this work with the Canon RF 100-400mm f/5.6-8 IS USM Lens ?
Asked by: Lucy
Yes but you will lose auto focus. You won't know if the shot is sharp until you get it to photoshop. The viewfinder isn't good enough. Using a monitor of at least 7 inches will help for tripod setups.'There's nothing more frustrating than seeing all of your images out of focus. These were taken handheld with this extender and the 100-400: www dot daviscustomdigital dot com/Launch-Photos/FH-ArabSat-2019/ I got lucky that day - manual focus!
Answered by: John
Date published: 2022-11-23

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
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