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Canon Extender EF 2x III EF Lens

    Canon Extender EF 2x III EF Lens

    Manufacturer: Canon U.S.A., Inc.

    Item #: CAN-EF2XIII   •   MFG #: EXTENDER EF 2X III


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    Items similar to the CAN-EF2XIII


    Designed to extend a lenses focal length by a factor of 2x, the redesigned Canon Extender EF 2X III delivers optical performance on par with the finest 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, flare and chromatic aberration, and even has a new Fluorine coating that keeps soiling, smears, fingerprints to a minimum. Extender EF 2X III meets necessary standards in terms of rugged, dustproof and water-resistant construction, and should be in every professional's camera bag.

    • Specifications

      • Focal Length & Maximum Aperture Magnification: 2.0x
      • Lens Construction 9 elements in 5 groups
      • Max. Diameter x Length, Weight 2.8 x 2.1 in, 11.5 oz. / 72.0 x 52.7mm, 325g
      • Note: 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.


    by PowerReviews
    CANON U.S.A., INC.Canon Extender EF 2x III EF Lens

    (based on 9 reviews)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



    • 3 Stars



    • 2 Stars



    • 1 Stars




    of respondents would recommend this to a friend.

    Reviewed by 9 customers

    Displaying reviews 1-9

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    Perfect Compliment to 135L

    By Daniel

    from Carson City, NV, United States

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    I am using this 2X extender with my 135L, and I must say that after a little micro adjustment of +5, this is incredible! I now have a 270mm f/4 lens, and the images are very, very nice. Wide open (f/4), there is a little softness or dreamy effect, but stopped down to f/5.6, images are extremely sharp and contrasty. Yes, this will enhance any flaw in your lens, but with higher quality lenses, should not be much of an issue. AF is fast, I have not had any problems with its speed or accuracy. Overall, I am extremely pleased with this extender.


    Exceede my Expectations

    By Architect1776

    from Williamsport, PA, United States

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    I acquired this extender to add length to my new 100-400mm L MII lens. I use it on my 7D. I knew from reading my manuals that AF is not possible so that is not an issue as I educated myself in this regard. But what images, I really cannot find fault with the image quality of this extender. It is like the lens and extender were designed for each other. Very sharp. Now obviously on very distant shots there is degradation but again I know this is due more to atmospherics than the lens. On shots within 1/2 mile absolutely incredible I recommend this extender for those who understand the AF limitations.

    (4 of 10 customers found this review helpful)


    Auto focus doesn't work :-(

    By SignGuy

    from Everett, WA, United States

    Verified Buyer

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    I got this for my EF 100-400 IS lens and it won't autofocus? On the documentation is says it works with the lens Well it works you just have to manual focus and my eyes are like they used to be so it's basically worthless. I just picked up a new 7D mk 2 but haven't tried it with that, I hope it does otherwise I wasted a bunch of money on it. If I knew that it wouldn't auto focus I would have bought a knock off for half the price that does the same thing. Not a happy camper.

    (2 of 10 customers found this review helpful)


    Autofocus does't work with my canon lens!

    By Traveler

    from Denver, CO, United States

    Verified Buyer

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    I bought mine several years ago and never got chance to use it. I just got a new camera and wanted to try it, but I am so disappointed, the autofocus doesn't work at all when used with EF100-400mm f/4.5-5.6 L IS USM on 5ds r.


    Great extender for my needs

    By Shiftysdad

    from IL

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    Outstanding images with this in conjunction with my 300mmF2.8L. Frustrating that it does not work with the 100-400 F4.5L ll USM, while it did work with the original version of this lens, (although this was not consistent). I also own the 1.4x extender. Curious that it works with all of the above mentioned lenses.


    Excellent addition

    By Ewp

    from Fairfax, va

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    This extender when paired with a high optical quality lens can yield sharpness very close to one of the long primes. I've paired it with the 300mm F2.8L IS II lens and a 7d mark II body to get almost 1000mm at f5.6. Image sharpness is very close to what I get with a 600mm f4. AF speed is very fast. It seems slow but due to the design it doesn't have to move AF as far so the net time to acquire focus is about the same. I use this set up with the 300mm to hike with. I can take it places I cannot go with the 600mm f4. Note that it will magnify a poorly performing lens. I definately recommend this if you have a need for occasional long distance photography.


    Failed Basic Quality Test

    By Great Dane

    from North Texas

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    In wildlife photography, one seldom sees a distant object of interest filling the entire frame. Therefore, options to improve the picture often include: 1. cropping to the desired object size, or 2. using a longer lens, or 3. using an extender with a compatible long lens. In the comparison between 1 and 3, I used a a Cannon 5d Mark II and a EF100-400mm f/4.5-5.6 L IS USM.(Push/Pull Model) ISO 400, Aperture Pref., Daylight WB. set at f5.6 and 400 mm, and handheld for Case 1. For case 3 all the same except that an EF 2XIII extender and a heavy duty tripod was added and the f stop went to 11. In both cases, the resultant shutter speed was fast enough to eliminate any camera shake. When case 1 and case 3 photos of stationary birds at a sun lit feeder at a distance of about 25 yds were cropped to the same object size, not only was there NO IMPROVEMENt in case 3 but actually, the pictures became grainy, noisy, and and had color distortions on the edges of the objects. The Extender appeared to be well built and attached and detached easily. With the above combination, standard AF will not work because the max f is 11. However, the "workarround" of shooting in "live mode", with AF on, AF driver set as "Live" and focussing by depressing the "AF-ON" button till the rectangle turns green is easy and gives an accurate focus but slightly slower than standard AF. Since the investment cannot yield an improvement for the particular use for which I purchased it, I returned the Extender.


    Great Product

    By Jake W

    from Stillwater, MN

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    I use the 70-200 F2.8 ISII which is a versatile lens. This gives me another level of versatility and coupled with the 5DMKIII, I still have plenty of light. This is a great option until I can decide on whether the EF 200-400mm f/4L IS USM with the built-in Extender or the 500mm will be my next lens.


    Auto focus doesn't work on most Canon cameras

    By AHShiker

    from Sonoma County, CA

    Comments about CANON U.S.A., INC. Canon Extender EF 2x III EF Lens:

    Auto focus does not work with the 2x-III extender on most Canon cameras. Nothing on the product specs or description documents this shortcoming. Auto focus works in LiveView only on my 6D/100-400 combo, but it is way too slow to be useful at all. I sent it back the same day.

    Displaying reviews 1-9

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    Add Accessories for your EXTENDER EF 2X III: