Telephoto performance with teleconverters

[ChrisNardone]

Does anyone have a link to any lens reviews that address telephoto lens performance with teleconverters. I'm curious what a tc does to the MTF ratings.

[PaulB]

If you treat yourself to Canon Lens Work III you can have all of the Canon MTF curves for all their current lenses with and without the Extenders.
It's a very informative book on the whole lens range with example photos. too. Well recommended.