« on: August 10, 2013, 07:18:13 AM »
The main difference, IMO, is that with the 1.4 TC you have a larger image in the viewfinder, making it easier to focus accurately.I have been thinking of picking up one of these, but It will not autofocus with a 1.4 correct?It will autofocus on the 5D III or the 1D. But, my experience is that using the 1.4xTC is no better than upping the resolution by 1.4x in Photoshop.
I have a Sigma 100-300 2.8 with a 1.4 and 2.0 extender. Best bet would be to probably just stick with that combo right? My copy is pretty soft though with the 2.0 extender on.