Kenko MC-4 2x “DG” Teleconverter for Canon EOS
Kenko MC-4 2x “DG” Teleconverter for Canon EOS Review
Overall this is a good teleconverter for the price. It says that it will keep the auto focus fully functional to F4 but I did not find this to be the case. I used it with an F4 lens and it had a very hard time focusing, [...]