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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

Mount
Canon EF
Magnification
2x
Optical Design
9 Elements in 5 Groups
Light Loss
2 Stop
Length
2.1" / 52.7 mm
Diameter
2.8" / 72 mm
Weight
11.5 oz / 325 g
Packaging Info
Package Weight
0.99 lb
Box Dimensions (LxWxH)
5.3 x 3.75 x 3.7"

Canon Extender EF 2x III Reviews

See any errors on this page? Let us know

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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