[Gaza]

Hi Chukie
Best advice i can give, is to go to a good camera shop, with your camera and lens, and ask if you can try one first
It may save you, a lot of money

I have friends, who have loaned me their teleconverters, to try on my 400D and 70 - 300mm IS lens
In short, it doesn't work, with auto focus
According to Canon, You can only use teleconverters on their " L " range lens

Unless someone out there knows differently
Please let me know, as i also would desperately love to use one

Just checked out. Your lens stops down at f.4 Same as my 300mm
According to Canon for the auto-focus to work you will need a lens that stops down to f.2.8

The teleconverter, i tried was the Kenko 1.4 DG AF Pro
But if you find one that does work. Please let me know

Cheers