Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates phenomenal optical performance with minimal chromatic aberration and is a perfect complement to many of Canon super telephoto lenses.
It features a built-in microcomputer for seamless communication among camera body, lens and extender; features careful lens placement and coatings to minimize ghosting and flare and even has a new Fluorine coating that keeps soiling, smears and fingerprints to a minimum.
An integral part of many professional systems, Extender EF 1.4X III maintains high standards not only optically, but also in terms of rugged, dustproof and water resistant construction.
This lens 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. Additionally, please see the lens and/or camera body manual for full compatibility information with the Extender EF 2X III.
Lens Compatibility Chart
EF 135mm f/2L USM - AF Possible -
EF 180mm f/3.5L Macro USM - AF Possible - The autofocusing range is from 2.6 feet/0.8m to infinity.
EF 200mm f/2.8L II USM - AF Possible -
EF 200mm f/2L IS USM - AF Possible -
EF 300mm f/2.8L IS USM - AF Possible -
EF 300mm f/4L IS USM - AF Possible -
EF 400mm f/2.8L IS USM - AF Possible -
EF 400mm f/4 DO IS USM - AF Possible -
EF 400mm f/5.6L USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only
EF 500mm f/4L IS USM - AF Possible -
EF 600mm f/4L IS USM - AF Possible -
EF 800mm f/5.6L IS USM - AF Not Possible - With the EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS-1v, EOS 1v HS and EOS-3, AF is possible with the center focusing point only
EF 1200mm f/5.6L USM - AF Not Possible -
EF 70-200mm f/2.8L IS USM - AF Possible - If the lens is attached to an EOS camera, having multiple focusing points and an Extender is attached to the lens, only the center focusing point will be useable for AF.
EF 70-200mm f/2.8L USM - AF Possible -
EF 70-200mm f/4L IS USM / USM - AF Possible -
EF 100-400mm f/4.5-5.6L IS USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only. The Image Stabilizer does not operate with the following cameras: EOS650, 630, 620, 600, RT, 700, 750, 850, EOS-1, A2, A2E, 10s, ELAN, Rebel, Rebel S, Rebel II and RebelSII.
The Canon 1.4x is commonly used for Landscape/scenery, Sports/action, Weddings, Wildlife photos and more.The Canon 1.4x is most used by customers who consider themselves to be a Photo enthusiast, Pro photographer, Semi-pro photographer among others.The Canon 1.4x is popular because customers like the following qualities of the Canon 1.4x: Consistent output, Durable, Easily interchangeable, Fast / accurate auto-focus, Lightweight, Nice bokeh, Rugged and Strong construction
Most Liked Positive Review
This is a significant upgrade to the previous version II. Highly recommended, especially with the new f2.8 300 and 400 lens from Canon Worth the money.
Most Liked Negative Review
Okay but needed more
Had wanted the 2X Teleconverter, but it would not available at the time, and let someone talk me into the 1.4 X. Just doesn't do what I needed it to do.
Reviewed by 30 customers
Since moving up to a full frame camera from a cropped sensor, I miss the extra reach that the cropped frame gives to the lenses. This tele extender almost gets it all back - (1.6 vs 1.4) without a sacrifice to clarity and with only one f stop difference.
The 1.4x II version is a very good one, but this one makes for noticeably faster autofocus.
I use this with my 100-400 IS II lens and my 400 F4 DO lens. works well and is reasonably sharp, especially with the F4 lens. They charge too much for this product. It is way overpriced.
excellent combination with the 300 f2.8L
Very happy with the extender. Use it on my 300 L f4 with my 7D.
When I upgraded to a full frame sensor I missed the additional magnification. I had played with a 2.0 II extender, but found the IQ loss just too much. This pairs very well with a 5DMKIII and a 20-200 f2.8 LII IS lens. Obviously, not as tack sharp as the lens on its own, but a great compliment to get the extra 80mm of tele.
I hated my old 2x extender but still needed more reach on my 70-200 and couldn't afford the 300mm 2.8 lens yet. I read some other reviews and this 1.4 seemed pretty popular. Turns out, it's pretty darn good. The improvement over the 2x is stunning. The slow focus and softness are reduced to usable levels. I use this mostly for college football games and can still get good focus with fast action and the softness, which is noticeable still, is acceptable in the world of fast action. I would hesitate to use this for still life or portraits though.
added to my Canon EF 300mm gives the additional magnification I was looking for in photographing wild life...loss of speed (reduced to 5.4) has not been a problem except in the early morning and late evening...compensated by adjustment in ISO...would recommend for wildlife shooting
I upgraded my from a Tamron 1.4x. The Tamron worked well on my APS-C cameras but when I went full frame there was quite a bit of vignetting. This 1.4x iii work like a champ with my 400 5.6 and 5D3. I'm sure it will be stuck to the 400 5.6 whenever I'm birding or need the additional reach provided the light is good enough or I have my tripod. Optics seem first rate. The release mechanism is also superior and it would be quite a feat to accidently release the lens from the TC.
I love this extender for shooting the surf. The only downside I see is the slower autofocus on my 7D