Thanks guys, appreciate the honest feedback. Looks like it'll pay off to practice a bit (well, a lot) more with it the extender. You guys didn't see all the shots I threw out
Dave - would love to try the 1DX... knowing myself, I'll want to get one though
However with the 100-400, at the long end with a 2.0x TC (800mm), even the 1DX would still have to manual focus since it'll be at f/11, if I understand the charts correctly.
Another from the day (with AF this time and no extender)
, on Flickr