I would think that this would be a great zoom range for many activities?
Is it the price? I know if Canon made a f4L version of one of these the price would be big. What type of speed would be best for a lense like this. Or does canon just prefer to let people use the 1.4 or 2X Extenders?
I know the Canon 70-200 versions are very popular, but when you want something longer you either have overlapping with the 100-400 or have to go with a prime.
After seeing threads about the 50-500 Bigma, it got me thinking.