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Canon EF 2.0X III Telephoto Extender for Canon Super Telephoto Lenses
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- Compatible with Select EF Mount Lenses. 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
- 2.0x magnification factor
- 9 elements in 5 groups lens construction
- Spectra coating reduces ghosting/flare
- Dust and water resistant
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|Sold By||Amazon.com||SSE Photo & Video||Amazon.com||Camera Wholesalers Inc||Amazon.com||Photo Savings|
|Compatible Camera Mount||Canon EF||Canon EF||Canon EF||Canon EF||Canon EF||Canon EF, Canon EF|
|Focus Type||auto-focus||auto-focus||Ultrasonic||Ultrasonic||Ring-type ultrasonic||auto-focus|
|Item Dimensions||2.09 x 2.83 x 2.83 in||1.06 x 2.83 x 2.83 in||10.12 x 3.54 x 3.54 in||7.44 x 3.62 x 3.62 in||7.83 x 3.5 x 3.5 in||1 x 1 x 1 in|
|Item Weight||0.72 lb||7.83 ounces||2.8 lbs||3.04 lbs||2.9 lbs||1 lb|
|Lens Type||35mm||35mm||Prime lens||Zoom lens||Zoom lens||teleconverter|
|Maximum Focal Length||2 millimeters||1 millimeter||400 millimeters||400 millimeters||200 millimeters||—|
|Minimum Focal Length||2 millimeters||1 millimeter||400 millimeters||100||70 millimeters||—|
|Photo Filter Thread Size||—||—||77 millimeters||77 millimeters||77 millimeters||—|
The Canon Extender EF 2x III is 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.
From the Manufacturer
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.
- 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
Legal DisclaimerFULL 14 DAY SATISFACTION GUARANTEE AND A 90 DAY PARTS AND LABOR WARRANTY. SERIAL #8100003479
Top customer reviews
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1. There is no such a thing as free lunch. Anyone who claims fast autofocus with this combo is smoking something. Canon white papers claims a 75% reduction in autofocus speed. It will also degrade image quality, no matter what lens you put it on.
2. As for Image quality, acceptability, and degradation, there are several factors in play. Of course where you end depends on where you start. used on an optically superb lens, after some image degradation, you can still end up with good image quality. with mediocre lens, you end up with bad, and with a bad lens, you end up with mush. The other factor in acceptability is the image density of the sensor. The image quality will be a lot more acceptable on a 5d2 or 40D for example than the 7D. the higher pixel density of 7D is far more demanding on lens resolution. furthermore, the cropped sensor of same pixel count, greatly magnifies Chromatic aberration.
3. In addition to loss of image quality secondary to use of extenders, going from say 200 to 400, requires great improvement in long lens technique. any movement is greatly magnified. for someone to properly assess the functioning of the lens, esp when used for things such as birds in flight, great technique is required.
4. there are obvious things that one must know. in addition to double the focal length, you loose 2 stops of light with the converter, so a 2.8 lens becomes a 5.6 lens. if you are starting with a lens with max aperture smaller than 2.8, you will loose autofocus on all current bodies, except for the 1D/1DS class. The coming 1DX has also dropped support for lenses slower than f 5.6.
Edit april 2013.
As many are aware, Canon updated firmware in 1dx to now support f8 focusing with central focus point, and has promised similar upgrade with canon 5dIII. so autofocus is still possible with the TC mounted on a f4 lens on those bodies.
Edit Jan 2015
Some things have changed in the original review, which deserves an update. Most importantly, with introduction of Version II of canon super teles (300, 400, 500, and 600), the reduction in AF speed has certainly improved. Also there are better optimized to work with this Extender and claims are that the loss in image quality is less. Whether that is truly due to optimization of lens and extender, or due to the superb quality of the new supertele's I dont know. probably some of each. Of course if you are already shooting with one of the version II super Teles, you are not reading this review, since you already know a ton on this topic.
Second, on the review 14, Mr Mark Cunningham states after quoting excerpts for canon papers
******Accordingly, overall AF performance remains essentially unchanged with an EF Extender attached, versus the lens's AF speed without an extender.*******
this is absolutely and simply not true, and I have use the extender with the caon 70-200 2.8L II lens. the lens focuses blazingly fast and tracks very well bare on my 5d3, it is indeed slower in tracking than the original 100-400L with the extender attached and thats a very real, practical and palpable difference in af speed.
I'm extremely happy with it, and have to say that on a high quality lens, like the 70-200/2.8 IS II, there is hardly any loss of functionality at all. Yes, you do lose two stops, but getting a 400mm F/5.6 is not bad at all, and the 4 stops of the IS on the IS II certainly helps a lot. And these days, with the ability to shoot high ISOs without much noise (such as on the 5D3), it's not an issue getting clear shots at 1/500s or faster during the day.
There is some SLIGHT image degradation, to be expected, but it is not noticeable at all unless you are seriously pixel peeping. Only at 100% crops would you be able to tell the difference, and the gain from the extra focal length far outweighs the slight loss in image quality.
You do also get slower autofocus, again, because of the reduced effective aperture size (less light passing through, so it's harder for your camera to detect focus). The 70-200/2.8 IS II has extremely quick autofocus to begin with, so the reduced speed is not too bad. On slower autofocus lenses (such as if you use this extender for macro work, like on the 180mm F/3.5L Macro), the autofocus is nearly downright impossible and you may just be better off using full time manual focus.
You also won't be able to use all the focus points that you're used to using, since you'll only be able to use the points that respond to f/5.6 or slower with a F/2.8 lens. On the 5D3, this means only the center rectangle of points (about 21 cross type points). The 1DS3 and 1DX give you a bit more focus point options at f/5.6. And on lower end cameras, you may be only able to use your center AF point.
On slower lenses, such as f/4 or slower, you may be limited to manual focus only. That's why I really only recommend using a 2x extender on an f/2.8 lens. On slower lenses, you're better off using a 1.4x extender.
The compact size and relatively light weight of the 2x extender makes it a must-bring any time I bring my 70-200 outdoors. Plus it gives me the flexibility of having either a 70-200/2.8 or a 140-400/5.6 at any time I want.
It's especially great to use for wildlife (especially birds and other animals) and sports, if you're shooting during the day. For anything more serious, or in lower light, you'll need to spring for a 300/2.8 or 400/2.8, which are prohibitively expensive unless you're using it regularly for your full time job.
The only other test I did was with a Canon 135L f/2 lens; the 5D4 autofocuses through the viewfinder, giving a 270mm f/4 lens. Not sure what good that is but now you know. Didn't try it with the 7D2.