Canon Extender EF 2x III

Mfg.Part: 4410B002 | CDW Part: 2341136 | UNSPSC: 45121603
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Main Features
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Designed to extend a lens's 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 fluorine coating that keeps soiling, smears and 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.

Canon Extender EF 2x III is rated 3.2 out of 5 by 10.
Rated 3 out of 5 by from Affordable telephoto alternative, at a cost There seems to be a consensus, both here and elsewhere, that the ideal lens with which to use this extender is the latest version of the f/2.8 70-200. That's how I use it (on a Canon 6D), and while it does indeed double my zoom capabilities, there are some important hitches:• Autofocus suffers greatly. Without the extender, the lens is quick and accurate; with the extender, it often has to focus all the way out, then all the way back in. Even after all that, it often doesn't catch the focal point I wanted in the first place, forcing me to repeat the process until it does. This is especially frustrating because the camera setup becomes much more unwieldy with the increased barrel length, so you have to work harder for longer to hold the shot steady.• Most importantly, the final image suffers noticeably, especially important if imperfections bug you or you want to publish or print your shots. I get very nice and crisp shots with the f/2.8 70-200 alone; but when I add the extender, images take on a slightly fuzzy, sculpted quality I definitely don't want. It might be due to the unwieldiness, which could be making my hands less steady when I'm shooting; but I'm working extremely hard to hold the rig steady, and I have pretty steady hands to begin with, so I think most users would experience as much or more of the same effect.
Date published: 2018-04-12
Rated 5 out of 5 by from Perfect Compliment to 135L 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.
Date published: 2017-04-22
Rated 5 out of 5 by from Exceede my Expectations 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.
Date published: 2017-03-22
Rated 1 out of 5 by from Auto focus doesn't work :-( 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.
Date published: 2016-04-18
Rated 1 out of 5 by from Autofocus does't work with my canon 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.
Date published: 2016-04-01
Rated 5 out of 5 by from Great extender for my needs 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.
Date published: 2015-08-09
Rated 5 out of 5 by from Excellent addition 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.
Date published: 2015-03-17
Rated 1 out of 5 by from Failed Basic Quality Test 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.
Date published: 2015-02-26
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