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This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, and 100-400 f/4.5-5.6L IS zoom lenses. Superb optically, it preserves the image quality of the lens it's mounted to and multiplies its focal length 1.4x. Effective aperture is reduced by one f-stop; autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture. The version II maintains the outstanding optics of the previous version, and adds enhanced weather- resistant construction, and improved anti-reflective surfaces in the barrel.
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By Jeff Kraus (Orlando, FL USA)
Obviously, you can't expect to include additional glass elements to a lens without any reduction in resulting image quality whatsoever. But after using this alongside another (3rd party) teleconverter, I feel that I can safely conclude that this is the best one on the market for Canon cameras.
I use this teleconverter in conjunction with an EF 70-200mm f/2.8L USM mounted on a Canon EOS 40D. The multiplier turns this lens into an effective 98-280mm f/4. Autofocus still operates beautifully, and the loss in image quality, especially when stopped down a little further, is almost unnoticeable. You'd really have to get in there to see any problems, and sometimes I can't even do it then.
I have added a couple of images taken with the extender, showing off some of its capabilities.
As a seller, B&H Photo and Video probably ranks #1 in my book in terms of honesty and customer service.
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Buy Canon Extender EF 1.4x II - Converter - Canon EF Now
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