Quote Originally Posted by Busted Knuckles View Post
Autofocus speed? Function with1.4 or 2.0 TC.

When I ponder a 600 other than the occasional lion or bear, most times focus speed is going to be important.

With lions and bears I am thinking TC function may be important and tigers. Oh my!

Any findings on these items?

Thanks.

Mike
There has always been a speed penalty with the old versions of the TC and the big whites.
I will bet this lens is the same.
Regardless I have them in the B&H basket to order later tonight.