 "Great addition to the lens" | 2009-10-06 |
| - Reviewed By User: A34POZKGWVTD98 |
| I'm using this with a 70-200 2.8L IS USM lens and it works great. Fast focusing, great alternative to another lens. The only downside is the loss of an f-stop. |
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 "A necessary "evil?"" | 2009-10-03 |
| - Reviewed By User: ANZHPMJLXBU9T |
| You want reach? You want weather sealing? Here it is. Too bad there is some obvious image degradation. This is my second copy. It seems to work better (that is to say I don't notice the IQ difference as much) than the first one, however, so I am pleased about that. It's an inexpensive and cost-effective way to gain a little reach and it only costs one stop of light, so for the most part, it's worth it. Recommended. |
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| "An excellent and compact way to extend your telephoto lenses" | 2009-10-01 |
| - Reviewed By crdic |
The EF 1.4x II Extender is a cost-effective and highly portable way to add some extra reach to your telephoto lenses. One thing to note right up front, though, since apparently some shoppers seem not to realize it, is that it is not compatible with all lenses. It is, in fact, compatible only with a specific set of Canon EF lenses: L-series primes of 135mm or longer, and the 70-200mm L and 100-400mm L zooms. It will not work with other lenses, and in particular it will not work with third-party lenses from Sigma, Tamron, or other manufacturers. It is not a completely generic adapter; a lens must be designed to fit it.
The Extender increases the focal length of a compatible lens by 1.4x, and correspondingly decreases the lens's maximum effective aperture by one stop. A 70-200mm f/2.8 lens thus becomes a 98-280mm f/4 lens, and a 400mm f/5.6 lens becomes a 560mm f/8 lens. Extended focal length and effective aperture are correctly reported to the camera by the Extender. Auto-focus may become somewhat slower (though with my 70-200mm f/2.8 I have not noticed it), and if maximum aperture falls below f/5.6, auto-focus may be unable to function. (This is not the fault of the Extender, but a limitation of most of Canon's camera bodies, which require an aperture of f/5.6 or better for auto-focus.)
Image quality is quite good, though one should not expect a lens with the Extender to deliver performance comparable to a longer lens. Canon's 100-400mm f/4.5-5.6 lens, for example, will deliver a somewhat sharper image at the same focal length and aperture than the Extender with a 70-200 f/2.8 lens (though you may have to go pixel-peeping, or print your photos out at an extremely large size, to see the difference). The standard I apply is that the Extender should do a better job than simply shooting without the Extender and using software to crop and blow up the image. By this measure, it succeeds, though if focus is less than perfect the difference is easily lost.
Along with the increase in focal length comes a corresponding reduction in depth of field, which for some applications will be just as important as the increased magnification. A 200mm lens with the Extender has the same depth of field as a 280mm lens at the same aperture.
So, to sum up, while the Extender won't deliver results quite as good as longer lenses would, it does a good job, and it's a lot less expensive than adding to your lens collection, and much more portable than carrying around more lenses. Plus, if you ever do buy longer lenses (assuming that they're Canon L-series), the Extender will work with them too! |
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| "A Must add-on for this Lens" | 2009-09-22 |
| - Reviewed By User: A2O50IIGDVR81M |
| This Canon EF 1.4X II Extender is a must when using the Canon EF 70-200mm f/2.8L IS USM lens. It really complaints the lens and adds to the zoom when needing to get close. I'm really happy I purchase the Extender when I purchased the new lens. You won't be disappointed at all. |
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| "Canon Extender is super" | 2009-09-13 |
| - Reviewed By User: A1T61C4U8U44EU |
I have this canon extender and works wonder if you want longer range. Most of the extender is use for the white lens except for the 28-300mm f4.5-5.6 L lens. Highly recommend this teleconverter. |
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 "If you have the 100-400mm f/4.5-5.6L lens, read this first" | 2009-08-22 |
| - Reviewed By mhnstr |
I purchased the 1.4 extender to increase the range of my Canon 100-400mm f/4.5-5.6L USM IS lens. I checked the Canon website to ensure compatibility and read the reviews regarding image quality before purchasing. What I missed was that the extender increases the lens to an f/8 which exceeds the aperture opening auto focus requirement of my Canon 40D. Therefore, to use the 1.4 extender, you must rely on manual focus with the 100-400mm lens. There are a number of websites out there which discuss how to tape the contacts of the extender to allow the autofocus to work. The results of the modification are mixed with some people claiming that the performance of the lens can be affected.
The loss of autofocus may be an acceptable compromise when compared to the cost of purchasing the longer Canon lenses. However, it is something to be aware of before purchasing the 1.4 extender for the 100-400mm lens.
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