Product Description

Bower MC4 2X AF Teleconverter for Canon EOS EF Lenses - Bower SX4EOS

Product Details

• Color: Black
• Brand: Bower
• Model: SX4EOS
• Dimensions: .69 pounds

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

Customer Reviews

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.

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.

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