Quote Originally Posted by btaylor


I wonder how much the reduction in AF speed would hurt. At the moment AF is pretty much instantaneous. 1.75 x bugger all = still bugger all [img]/emoticons/emotion-2.gif[/img]



That would be correct!


The AF speed is still very useable, as you mentioned 75% slower X very fast is still fast.


The AF speed reduction as reported by Canon, has to due with the smaller aperture of f/5.6 as well as the reduction in IQ from the extender.


By the way, in case you weren't aware, the 1.4X extender has a 50% reduction in AF speed.





Rich