Tag : 2x af, lenses, teleconverter canon, bower mc4, eos ef

Company : Bower List Price : $149.99 Amazon Price : $67.99 Used Price : Average customer review :

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Features

• 2x autofocus teleconverter/extender for Canon EF lens system
• Magnification: 2x
• Optical Construction: 4 elements in 4 groups
• Fully Multi-coated, automatic diaphragm coupling
• Made in Japan, Lifetime Garantee

Product Description

Product Features Description The Bower MC4 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. This precision optical accessory, which is compatible with your Canon EOS SLR camera, allows you to increase the focal length of your lens without sacrificing optical quality. For example, using a 2x teleconverter with a 300mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6. It also reduce depth of field to the 50% of the master lens. Not compatible with new digital EF-S lenses.

Customer reviews

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.

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.

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.

Decent fot the money
Does not give you the feel of 2 x zoom but it does help.
If you are using an image stabilized lens you will lose the Auto Focus abilities of the IS lens

Good image quality poor auto focus
I use this teleconverter with the Canon rebel XTI and the Canon EF 75-300 f4-5.6 III USM lens. The image quality is fine but the autofocus is poor. The lens (with the teleconverter) focuses very slowly at focal lengths under 270mm and at full 300mm it will not autofocus at all. Manual focus works just fine.