SX4MAX 2x Telextender

I have had this teleconverter for several years. It does work, however as others have mentioned, autofocus is troublesome. Every auto-focus lens I have tried will endlessly hunt if your in medium to low light situation and you ultimately have to...

The Bower tele-converters work only on Canon's EF lenses. It will not work on the Canon EFS lenses. There's a difference in the way the EF and EFS lenses are made. The Canon camera body will accept both EF and EFS lenses, but Bower tele-converters...

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...

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...

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...

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

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...