Nice shot. I wouldn't be surprised if the Kenko TC throws AF off a bit. There's a reason it's so much cheaper than the Canon TC. I should also get around to MAF'ing the lenses now that I have the 7D. I should grab a used Canon 1.4x TC II. I went with the Kenko so I could use it with the 24-105 and my Roki 85.
The other issue there is my lack of ability to hold still enough to deal with 200mm+ range and no IS. I've always had problems doing that.
"I know rocks. Rocks are hard."