Canon already came out with it, didn't you hear?


It's called the 70-200 f/4 L IS with 1.4X TC. Traditional zoom ring, latest IS, weather sealed, etc. Pity they lost 100mm on the long end, though.





Seriously, that is what I'm using and if you can make do with just 300mm, it's great. The image quality is every bit as good.


Here's Bryan's comparison.