Will the 7D autofocus with the 500 4.0 and a 1.4 extender?

After reading a bunch of the reviews, I am considering a 7D for BIF/Wildlife pics. One question I have not seen answered is whether the camera will autofocus w/ the 500 4.0 + the 1.4 extender. My eyesight isn't what it used to be (and even when it was, it wasn't that good) so I do rely on the camera's autofocus.

Thanks!

yes
i have that setup.
Rob.

Brad Remick wrote in post #9165591
After reading a bunch of the reviews, I am considering a 7D for BIF/Wildlife pics. One question I have not seen answered is whether the camera will autofocus w/ the 500 4.0 + the 1.4 extender. My eyesight isn't what it used to be (and even when it was, it wasn't that good) so I do rely on the camera's autofocus.

Thanks!

Should be fine, that only brings you to f/5.6 and the 7D is fine with that.

You may run into problerms if you get a 2x, as that would bring you to f/8 and only 1D models AF properly at f/8.

thanks Guys. I appreciate the input! GyRob, how does the set-up work for you? Do you use it for BIF? How is the autofocus?

Brad Remick wrote in post #9165758
thanks Guys. I appreciate the input! GyRob, how does the set-up work for you? Do you use it for BIF? How is the autofocus?

it works great ,AF is fast and acurate ,birds are my main intrest so yes its great for bif.
Rob.

Of course it work. AF with TC will be slower for about 25%.