I want to buy a 1.4 or a 2,0 extender for my 70D but i heard my camera will not auto focus then

[irish626]

I want to buy a 1.4 or 2.0 extender for my 70D but I was told my camera would not autococus using the extenders and I would have to manually focus. Is this correct?

[ebiggs1]

John you do realize this is a 6 year old thread? I doubt the OP is around or interested any longer. They either bought or didn't by now.

[kodiakak]

yes its true I return mine today. i had the 1

ef usm 100-400 zoom the 4.5 f stop becomes 9.0 at best auto zoom  I tried auto focus but results were not that great

[kodiakak]

typo I meant auto focus will not work. on my 60D with 2x cannon extender 3  manual focus results were not great

[johnrmoyer]

Thanks. I failed to look at the date.