Cheap Bower MC4 2X AF Teleconverter for Canon EOS EF lenses (Electronics) Price

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Customer Reviews of Bower MC4 2X AF Teleconverter for Canon EOS EF lenses

Autofocus problem is not a problem
Some people have complained about autofocus problems. After reading a little about this, people must understand that for most autofocus systems to work the aperature must be 6 or greater (that means a number smaller than six). But, a 2x converter adds two f-stops to the aperature (decreases the aperature) so you must have a lens that goes no lower than f/4 for the aperature. Most zoom lenses go to somewhere are 5.3 to even higher numbers and that means that as you zoom in on a subject the autofocus will quit working. The answer is that with a teleconverter expect to use manual focus when using a zoom lens.

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Some good with some bad
I am please that the Bower 2X lens mounted to my EOS Rebel XT and performed well with my Canon EF 70-300mm zoom lens. But when my Canon EFS 18-55mm lens would not mount to the Bower 2X, I was very disappointed. The extra 1/8" of rubber-like material on the inner Canon EFS 18-55 lens will not allow it to fully seat in the Bower mount.

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Performs as expected
First off let me say that South Bay Camera handled my order very well. I really chose a teleconverter based on price. With that in mind I am very satisfied with the product. I confirm what other reviewers mentioned that the AF "hunts" for a focus at higher magnifications so I had to use manual focus. Other than that, I had no other problems with it. FYI, I used the converter on my Canon 75-300mm f4-5.6 III and my kit lens (18-55mm). It worked on both.