5D MK3 : Compatible TC

I have used this combination on 7D, Canon EF300mm f/4L IS USM + Canon 1.4x EF Extender II + Kenko TelePlus MC4 AF 2.0X DGX Teleconverter, without any taping, but you have to use Live View focusing.

I still have to try on 5d3.

Here you can see a couple of pics.

http://www.flickr.com/photos/rodor54/8270655952/in/photostream/

http://www.flickr.com/photos/rodor54/8109166791/in/photostream/