RRS wrote:
I would say you are wrong! I don't often say that either. The 70-200 mm lens with a 2x extender looks very sharp on its intended subject, the airplane. If you look you can read the fine print on the tail. Maybe why you feel that the image is soft is because of the DOF being much more narrow with the 2x converter. This combination, lens and TC works very well to separate the subject from FG/BG. I say it works very well and great for being handheld too!
Very sharp? You must be joking. Fairly sharp (considering it is an extender) would be the best I could give it.