Can I use AF when an extender lens is mounted? (EOS 70D)

Update Terakhir : 16-Jan-2015
Nomor isu : 8201842000

The availability of AF when an extender lens is mounted is shown below.

Type of extender	AF availability
EXTENDER EF 1.4x	When any of the extenders shown to the left are mounted on a lens with a maximum aperture darker than F4, AF cannot be used.
EXTENDER EF 1.4x II
EXTENDER EF 1.4x III
EXTENDER EF 2x	When any of the extenders shown to the left are mounted on a lens with a maximum aperture darker than F2.8, AF cannot be used.
EXTENDER EF 2x II
EXTENDER EF 2x III