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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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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
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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.
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One of my workhorse-carry-everywhere-with-me lenses is my 70-200 f/2.8L.Read more