Nate and Keith....a caveat to my "it puts the 40D to shame" statement."


Most of my bird shooting consists of songbirds and small raptors; the places I find these birdsare full of branches, limbs,etc....lots of distractions for the 40D AF to spend time trying to focus on my subject.


The 7D, in most cases focused on the firstattempt and at worst the 2nd attempt compared to 3 to 5 attempts w/the 40D. I missed quite a few shots because of the 40D's inability to nail it on the 1rst or 2nd attempt.


And please don't misinterpret my statement as a total put down of the 40D, it's been great, it's just the 7D's AFis a big improvement especially in a low light situations w/my 100-400.


Unfortunately I can't speak concerning the AI Servo and BIFs....I only had 2 good weather days to hunt for BIFs (specifically Eagles)and I didn't have any success. But it worked well during the hockey game I photographed w/a 70-200 IS 2.8.


BTW....my unscientific findings are based on using my 100-400 on both bodies in low light situations.


Nate....I think you'll find the 40D sitting in your bag the great majority of the time after using the 7D.


Regards


Bill