The following lenses are compatible with the Push Auto Iris and Auto Iris operations of the EOS C300 Mark II EF-S 10-18mm f4 .5-5.6 IS STM EF-S 18-55mm f3.5-5.6 IS STM
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