Bill4walsh wrote:
I now live where I have a Brook and lots of bird life. I was going to pick up the new Tamron 150-600mm G2. Then I saw a Canon 100-400, first version for a little more. Canon was used. I thought about a 1.4 extender. I have the Canon 5d II.
The Mark II is not able to auto focus that combo and you would be better off with the Tamron in the first place, as that is as far as I understand a pretty decent lens (at least the G2). I think you will get better image quality from that lens, as the Canon 100-400 is just a so-so lens, it really does not impress (I had one and got rid of it, it was just disappointing).