Now that my 70-200 is on a Fx body I sort of miss the crop for getting out there (zoom level). So I was thinking of getting the 2.0 teleconverter for it. Thoughts? My friend who shoots canon said to stay away from the 2.0 (or at least from canon because it is hella soft) but said the 1.4 is fine. Is this true for Nikon too?