I have a Canon 6Dii. The Kenko teleconverter doesn't work with any of my Canon lenses, including the 24-104 f/4L IS ii and the 70-200 f/4L IS ii. The camera keeps throwing an error message and there is no aperture for either lens. Luckily this works on my Tamron 100-400 otherwise I would have sent it back. There's autofocus, but it's slow and the camera is constantly looking for . With still subjects, it is faster to use manual focus. Hopefully someone will teach me how to make it work with Canon lenses.
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