Canon Community

Here is my situation, long time Canon DSLR user, purchased 7Dii, when using my EF 300mm f4 lens the 7Dii the lens did not recognize the lens for lens aberration correction. I sent the 7Dii in for repair because it was not giving me good focus. it was...

I have seen many charts and examples about auto focus with extenders but no mention about IS operating with the extender?Does IS function in with the extender the same as the auto function per the charts?